Comments and answers Answers and comments have been left on the questions below… There are a total of 227 questions... Anonymous on Kasundi stain in fabric loungeKasundi is the Asian or Bengali variety of mustard sauce. It is a pungent paste of fermented mustard seeds, spices and sometimes dried mangoes, dried Indian plum and olives Dr Chemical on iron oxide stainsHow do you know it's iron oxide? Is it borestains is it? Anonymous on Diggers Paint CleanupGreat, thank you for your help! Dr Chemical on Diggers Paint CleanupFair enough. Butoxyethanol is harmless. It may have a noticeable odour but it's not dangerous or toxic at all Dr Chemical on hard water stainsAjax Spray n Wipe contains lactic acid. If it's carbonate salts that will shift it. If it doesn't, it means youre left with sulphates, which are completely insoluble. But I'm told that razor blades work a treat, and they won't damage the glass Anonymous on hard water stainsI used methylated spirits once a day for a few weeks. Just spray it on and leave it. Slowly the screen cleans up. Anonymous on Diggers Paint CleanupThanks for getting back to me. Here is the - MSDS Sheet http://www.recochem.com.au/files/downloads/Paint_Cleanup_v3.pdf It states less than 5% - 2-Butoxyethanol, plus non hazardous ingredients and water Dr Chemical on What's your email address please? Dr Chemical on Diggers Paint CleanupI'm unfamiliar with that product. Does it say on the label what the active ingredients are Dr Chemical on Removing mirror from glassIf anything will work it's hydrochloric acid. Use it as strong as you like - it won't damage the glass. Make sure you follow the safety instructions on the label Anonymous on Biodiesel NaOHThanks for the reply. I've been making 100 ltr batches of Biodiesel for about a year now using only NaOH, works fine with a good shake up. I also pre treat my oil with the previous batches glycerol, it's like super drying your oil! Very keen to try the Cement method with the Methanol. I'm currently using 17% methanol doing a two stage 80/20 reaction. (first reaction 80% MeOH, second reaction 20% MeOH with the glycerol being drained after the first stage). Pretty sure I'll be able to reduce Methanol to around 15% using your method. Thanks again. Anonymous on Blue tack stain on rughttps://www.drchemical.com.au/questions/hardened-blue-tac-on-painted-wall Dr Chemical on Blue tack stain on rugFreeze it. Put an ice cube on it and it'll harden and with a bit of gentle tugging it should come off. A few strands of the rug might come with it, but it's well-nigh impossble to get it out by any chemical means Dr Chemical on Biodiesel NaOHThe ratio is 40/56. In other words, a 10% solution of KOH in MeOH is equivalent to a 10 x 40/56 = 7% NaOH. But I'm not sure that it's that soluble, although I haven't been able to find any hard and fast data Dr Chemical on How to remove cat urine from car upholsteryIs the issue the smell or a visible stain? If it's just the smell, then any acid should neutralise it (like vinegar) Dr Chemical on Jarrah oil stain off natural stone bench topYes, the biggest question is what is the actual surface - it's it's porous it's more difficult Dr Chemical on Jarrah oil stain off natural stone bench topIf it's sitting on top, it'll wipe off with turps. If it has soaked in, try oven cleaner. That should desorb it Dr Chemical on how to clean wood scuff marks of porcelain floor tileSugar Soap should do it Dr Chemical on Dark gray mould on exterior rammed earth (limestone) wallNope - given the intrinsic problems with limestone, I'd say a 2y turnaround is pretty good. Crommelins are good products Anonymous on Blue tack stain on rugThe rug is made out of 100% polypropylene Anonymous on Blue tack stain on rugThe rug is also made of 100% polypropylene Anonymous on How to remove cat urine from car upholsteryVinegar should neutralize it. Anonymous on Jarrah oil stain off natural stone bench topOven cleaner might help? Anonymous on Jarrah oil stain off natural stone bench topSorry, just saw the title say stone... what kind of stone? Anonymous on Jarrah oil stain off natural stone bench topWhat do you mean by "natural" bench top? Natural stone? What stone? Natural wood? What wood? Anonymous on Dark gray mould on exterior rammed earth (limestone) wallhttps://www.drchemical.com.au/questions/mould-on-liquid-concrete Anonymous on Dark gray mould on exterior rammed earth (limestone) wallhttps://www.drchemical.com.au/chemistry-at-home/garden/limestone-walls-and-the-problems-they-cause Dr Chemical on mud stains on kids clothesIt probably just needs mechanical agitation. It's a physical stain. The grains are physically embedded into the fabric and will resist most chemical approaches. Squirt any liquid detergent on, rub in with with your fingers and rinse. Or a steam cleaner will also work. Dr Chemical on Mouldy bathroom with marble tilesUse sugar soap. Spray it on liberally and then the mould will wipe away easily. If the grout between the tiles is lower than the tiles you may need to use a brush, but it will come away easily Anonymous on power steering oil over new vinyl teak flooringTry spraying a liberal dose of oven cleaner on it and wait 5 minutes, then get a pressure hose and blast if off. Franco Preo on Mouldy bathroom with marble tilesMarble is absolutely NOT inert, it is highly reactive to acids and to strong alkalis such as caustic soda (pH 14). In fact, any product over pH10 should be avoided. What you can use are marble pastes that are not dissimilar to Jiff. They do require a bit of work, either by hand or with a car polisher, but will get a good result. Crosby Tiles in Osborne Park have a product by Aquaseal that will do the trick. ________________________________________________________________________________________________________ Incorrect. Marble is extremely inert, even to strong acids. Sugar soap is all you need to clean it. But sealing it is a good idea. Normal ceramic tiles don't require sealing, but I'm not sure about marble Franco Preo on Remove Tumeric Stain From CarpetEven Preen can give you a whole world of problems, depending on fibre composition and what chemicals remain in the carpet after your bicarb attempt. You can potentially suffer colour loss if it is am acid dyed nylon! I'd suggest a safer (and cheaper) route is to go to your local supermarket or pharmacy and but some 3% Hydrogen Peroxide. First of all vacuum, vacuum, vacuum and then then vacuum again to get as much of the bicarb residue out, using the upholstery tool will work best. Then apply some of the peroxide, just enough to dampen the area and then walk away. Leave for 24 hours and repeat the process if necessary. If after 3 attempts it still hasn't moved, call a professional. Hopefully you have a synthetic carpet rather than a wool, and if so this should work. If it is wool, the bicarb will have already chemically affected the wool irreparably as it's alkalinity will degrade the fibre (typically turns an orange-brown colour). PS stain removal from carpeting is my job, so I think I'm pretty qualified to answer this question! Anonymous on Mouldy bathroom with marble tilesAs always, spot test if you have any doubts. Anonymous on Mouldy bathroom with marble tilesMarble is very inert and caustic soda only reacts with fats and oils so the oven cleaner will be very safe. Anna on Mouldy bathroom with marble tilesHi - I did search for: marble - as my concern is if the recommended mould treatments are safe on marble? Thanks ☺️ Anonymous on Mouldy bathroom with marble tilesSearching helps... https://www.drchemical.com.au/?s=mould+shower Anna on Whiteboard marker on school shirtThank you all! Anonymous on Is Glen 20 safe to breatheYes it is the ingredients are butane, propane and ethanol. You can look at the MDS and see this, these cause damage to the human body through inhaling Anonymous on Laundry Detergenthttps://www.drchemical.com.au/questions/choice-reveal-the-best-and-worst-household-cleaning-products-of-2018 Anonymous on Laundry DetergentOk thankyou! Do you recommend Dynamo? Any pick for a more natural product like Earth Choice etc or Method 4x detergent? Dr Chemical on yellow stain on white shirt collarNot sure what it is, but try sugar soap as a spot cleaner. Spray on, rub in and rinse. If that doesn't work, try Ajax Spray and wipe. If that doesn't work, White King Stain Lift laundry prewash Dr Chemical on Mould stains on cream paving bricksCaustic soda. Put a cupful in a watering can and tip it onto the mould. HP water will then lift it. Unless it's natural limestone, for which nowt will work Dr Chemical on Whiteboard marker on school shirtAcetone will do it. Put some in a glass or ceramic container and just dip it in and out Dr Chemical on Paint on paving bricksHeat gun. East peasy. If you don't have one they're only cheap from Bunnings Dr Chemical on Crayon on wallsOk - try metho on a rag. If that doesn't work get back to me Dr Chemical on Glycerine on Polyester skirtGlycerol is water soluble, but you'll probably have to use hot water as it's pretty thick Dr Chemical on Laundry DetergentYep - Omo and Biozet are still my pick. There is nothing toxic in them - that kind of thing is strictly controlled Anonymous on Crayon on wallsTry oven cleaner. Spray on, wait 5 minutes then wipe off. Kiam on Paint on paving bricksTry searching... https://www.drchemical.com.au/questions/paint-from-a-brick-wall Anonymous on Whiteboard marker on school shirthttps://www.drchemical.com.au/questions/removal-of-ink-stains-in-cotton-shirt-that-has-been-washed/ Anonymous on Whiteboard marker on school shirtAcetone Dr Chemical on sunscreen on polyester cricket shirtsGet some Kenco from Bunnings and use it as a spot cleaner. If that doesn't work try Ajax Spray n Wipe with lactic acid Dr Chemical on Removal of ink stains in cotton shirt that has been washedacetone will do it. Put some in a glass, isolate the ink stain and then dip it in and out of the glass until it dissolves Dr Chemical on Uniform stainTry using sugar soap as a spot cleaner. Spray it on, rub it in with your hands for a few minutes and then rinse. If that doesn't work, get some Kenco from Bunnings. It's a degreaser but it's an excellent spot cleaner Dr Chemical on How to clean a straw broomSoak it in sugar soap and then hose with a vigorous spray. If that doesn't work use oven cleaner Dr Chemical on Caustic Oven Spray on bench topIt looks like the caustic has damaged the lacquer or varnish on the wood, which is entirely believable. Only solution I'm afraid is to recoat it (or ask your cleaner to). And suggest that next time they use a noncaustic cleaner Dr Chemical on mould in shower recessSoap scum can be removed with Ajax Spray and Wipe Dr Chemical on mould in shower recessEasy. Squirt it generously with sugar soap. Wait a minute and you'll find with the gentlest of scrubbing it'll come right away. Oven cleaner will also work Dr Chemical on Anti stat spraySorry I have no idea Dr Chemical on head stoneTry Ajax Spray n Wipe. It contains lactic acid, which will probably work. Or you could use hydrochloric acid (about 1 in 5). It won't damage the headstone Dr Chemical on Removing marks from WindowsWell, the good thing is that glass is pretty much impervious to chemical attack. And as it happens it dissolves in both strong bases and strong acids. Try oven cleaner on it. If that doesn't doesn't work use hydrochloric acid from the hardware store (about 1:1). Make sure you wear gloves Dr Chemical on yellow stain on white shirt collarTry Kenco (from Bunnings). It's a degreaser, but use it as a prewash Anonymous on head stoneCreate your own question rather than asking in the comment section of a different question. Daphne on head stonehow do I get oil out of carpet spilt when oil lamp was knocked over thank you Matthew C. Kirk on Pen on light pink faux leather jacketWould you like to share about something Cafe Racer Jackets?? I will wait for your next blog. jim ridgwell on mould in shower recessThank you for your reply. I was really looking for help with this panelling in the shower recess. It is unique and unfortunately the generic answers don't apply to this product Anonymous on yellow stain on white shirt collarhttps://www.drchemical.com.au/questions/shirt-collar-stain Anonymous on Safe cleaner for leather loungeshttps://www.drchemical.com.au/?s=biro+pen Deborah Burley on Safe cleaner for leather loungeshow do I remove biro from my leather chair Anonymous on Is Glen 20 safe to breatheWhen abused as an inhalant, it may cause hypoxia (lack of oxygen), pneumonia, cardiac failure or cardiac arrest. Propane has low toxicity since it is not readily absorbed and is not biologically active MaryCW on Is Glen 20 safe to breatheIt contains butane and propane. Propane takes the place of oxygen in your lungs when you breathe it in... MaryCW on Is Glen 20 safe to breatheOops! I meant propane takes up the place of oxygen (not butane as I mentioned earlier). MaryCW on Is Glen 20 safe to breatheThis is highly toxic! Don't use it. It contains butane which when breathed in replaces oxygen uptake. Weakens the immune system. If you spray in a room where someone has a virus it sets them back because it deprives them of oxygen. Anonymous on mould in shower recesshttps://www.drchemical.com.au/?s=shower+mould Anonymous on Uniform stainI did try mineral turpentine which worked on the above stain but I can't continue using that indefinitely! Is there anything else that will work on paint stains? Thanks, Anna Ava Lucanus on oil stains on fibreglass bathHi Dr Chemical, thanks for the tip. Will Kenco work for essential oil stains in a fibreglass bath? Anonymous on Caustic Oven Spray on bench topW Anonymous on How to clean a straw broomSpray with oven cleaner then hose off after 10 minutes, and/or soak in a bucket of water with a cup of caustic soda then rinse. Anonymous on Uniform stainMaybe ask the teacher? Anonymous on Removal of ink stains in cotton shirt that has been washedhttps://www.drchemical.com.au/?s=ink Anonymous on Removal of ink stains in cotton shirt that has been washedhttps://www.drchemical.com.au/?s=biro Dr Chemical on Dissolve hair from a sinkNot much you can do about that I'm afraid. Hair is very chemically resilient. Hot concentrated nitric acid will do it, but you don't want to be doing that.... Anonymous on sunscreen on polyester cricket shirtsTry oven cleaner, spray on, wait 5 minutes. The oven cleaner should convert the sunscreen to soap by a chemical process call "saponification", it will then just rinse off. Anonymous on Use for biodiesel wasteIt's possible, but I'd be very surprised if 20L of anything into an entire truck would make any difference. He probably says it helps because he thinks it does - confirmation bias. Anonymous on Is Glen 20 safe to breathe"no-one can tell me... " That sentence in itself says you'll never be open to anyone telling you otherwise so there's not much point in trying to tell you otherwise. Dr Chemical on Is Glen 20 safe to breatheYes, I can tell you that an aerosol that you can taste in the back of your throat isn't harmful. It's only alcohol. Once again, there is no correlation between how bad something smells and its toxicity. If, for example, you got a whiff of Hydrochloric Acid fumes you'd come away coughing violently, as it is a very strong irritant. But that's all it is. Interestingly, in WW1 the Germans used chlorine gas as a poison. It was an ineffective poison, as the allied troops learned very quickly that if they urinated on a rag and put it over their mouth, the chlorine gas was converted to harmless (if unpleasant) hydrochloric acid. So it was unpleasant experience, if only for breathing in urine fumes, but at least they weren't poisoned. Anonymous on Dog stains on carpethttps://www.drchemical.com.au/questions/vomit-on-carpet Anonymous on Dog stains on carpetVomit Ash on BAM Easy off Spray for soap scum formula changeDr Chemical, Why are you not surprised. This was an excellent cleaner, why would they make it less effective? Anonymous on permanent texta on school uniform yellow collared topsThank you .....will try that Jennifer Grant on Is Glen 20 safe to breatheI only need to get a tiny whiff of Glen20 and I can taste the stuff in the back of my throat. I don't use it myself but have unfortunately come into contact with it when a client has sprayed it around. My tolerance of it is becoming less each time. Awful product - no-one can tell me that an aerosol that you can taste in the back of your throat isn't harmful. Dr Chemical on Getting rid of clothing mothsWell, in my experience you can't go past mothballs, which are just naphthalene. I think you can get them in flakes as well. A tried and tested method and the naphthalene is harmless to humans Dr Chemical on permanent texta on school uniform yellow collared topsAcetone should do it. Put some in a glass and then just repeatedly dip the effected area until it all comes out Anonymous on Getting rid of clothing mothshttps://www.abc.net.au/news/2018-02-17/how-to-deal-with-clothes-and-pantry-moths-in-your-home/9425618 Anonymous on permanent texta on school uniform yellow collared topshttps://www.drchemical.com.au/?s=pen Dr Chemical on AquadhereSoak it in water for a while. It should reliquify Dr Chemical on How to remove bore water stains from bricksSpecialised job I'm afraid. Go to www.borestainremoval.com.au Dr Chemical on Stains on Paving BricksHydrochloric acid. About 1 part in 4. Follow the safety instructions on the bottle. It won;t damage the pavers Dr Chemical on Remove Tumeric Stain From CarpetBicarb and vinegar is useless. It won't clean anything. Get some Preen Vanish carpet foam from the supermarket - that should shift it Dr Chemical on Blocked kitchen sinkCaustic Soda. Buy it from bunnings - tip a generous amount down the sink hole and flush just enough water onto it to dissolve it all. Then leave it for 15 minutes and rinse through and it should clear. You will notice the pipes in the u-bend getting hot - that's part of the process of the caustic reacting with the water and saponifying all the fat Dr Chemical on Post-it Note Stain on DressYikes. That's pretty serious. Okay - try acetone. I reckon that'll shift it. If that doesn't move it there's only one thing left - paint stripper. Go into Bunnings and look for a paint stripper that contains a chlorinated solvent. Look on the label. I think it's dichloromethane. Any chemical name with "chloro" in it will work. That's an even stronger solvent than acetone and should shift the yellow dye. And it won't hurt the cotton Anonymous on How to remove bore water stains from brickshttps://www.drchemical.com.au/?s=bore+water Dr Chemical on Dirt stain floor Fibreglass showerSpray it liberally with sugar soap and then scrub with a stiff outdoor broom. With a bit of luck that'll loosen it up and you'll be able to rinse it away. Dr Chemical on Removing the smell of bleach from a mattressThis is not as straightforward as it may seem. When you say that you have a bleach smell, you actually have the smell of chloramines. Chloramines are what you smell when you go to an indoor pool and think you are smelling "chlorine." Bleach is almost odourless. As any pool technician knows, the answer to chloramine smells is to oxidise it further. It's called "shocking" the system. One approach is to dose it with even more bleach - this oxidises the chloramines all the way through to nitrogen and salt. But I wouildn't tip more bleach onto your mattress. Get some Preen OxyAction laundry prewash. Squirt it on and leave it. It might need a few more applications. Hopefully that's a strong enough oxidiser to oxidise the chloramines Anonymous on Laundry Wash Balls using ceramic beadshttp://www.chem1.com/CQ/gallery.html Anonymous on Laundry Wash Balls using ceramic beadsSounds like BS to me... You might like to ask yourself (and them)... "each comprising a combination of different minerals" What minerals? "When these ceramic beads are submerged into water, the molecular structure of H2O is altered Exactly how is the water molecules 'altered' - https://en.wikipedia.org/wiki/Water_splitting "This process is unstable and constantly goes through a series of alterations every fraction of a second. " Exactly what 'alterations' do you speak of? "During this process, it emits far-infrared rays and negative ions, raises the pH, reduces the water molecule clusters into smaller clusters and removes the water surface tension. " How on earth does it emit electromagnetic radiation? What is a 'water molecule cluster'? "It’s through this process that the ceramics contained in the laundry ball activate the water so that the water can penetrate deep into the fibres, open them and remove the dirt in the same way the water does when activated by the chemicals in detergent." How does water become 'activated'? What makes you think water couldn't penetrate deep into the fibres in the first place? Since when has water ever been 'activated' by 'chemicals in detergents'? "The Laundry Ball therefore activates this water in a very similar manner to the chemicals in the detergent except at a molecular level rather than with chemicals." There's that water activation thing again. There's no such thing as water activation (except in the movies). Save your money and by a good detergent that is based on science and research rather than a sales pitch I say! Tom on Laundry Wash Balls using ceramic beadsI have copied information from a web site selling the balls. The link provided had nothing to do with my question these are for the home laundry. The Laundry Ball contains three different kinds of ceramic beads, each comprising a combination of different minerals. When these ceramic beads are submerged into water, the molecular structure of H2O is altered. This process is unstable and constantly goes through a series of alterations every fraction of a second. During this process, it emits far-infrared rays and negative ions, raises the pH, reduces the water molecule clusters into smaller clusters and removes the water surface tension. It's through this process that the ceramics contained in the laundry ball activate the water so that the water can penetrate deep into the fibres, open them and remove the dirt in the same way the water does when activated by the chemicals in detergent. The Laundry Ball therefore activates this water in a very similar manner to the chemicals in the detergent except at a molecular level rather than with chemicals. Anonymous on Leather couch replenishhttps://www.leatherlabs.com.au/information/neatsfoot-oil-explained/ This website says “due to the smell and oiliness, we do not suggest using it on your home furniture”. Is there anything I can do to reduce these effects or is there another less smelly/oily solution? Dr Chemical on Blu-tack in shorts pocket. What will remove it?Yep - Orange Power sticky goo and spot remover should shift it Dr Chemical on Water based Pot Sealant on CarpetTry soaking the area with an acetone soaked rag for half an hour. If that still doesn't work, go to the paint stripper section in Bunnings, and look on the labels for something with chlorinated solvents (typically chloroform or dichloromethane) Dr Chemical on Laundry Wash Balls using ceramic beadsThanks for that link. TBH, even having read the report I still don't know how they work. If the ceramic beads are inside the plastic balls I fail to see how they could clean clothes. So I'm a little sceptical. I've seen things like this where the plastic balls contained detergent beads, so they kind of worked by a controlled release mechanism. But the trouble with this is that they are in the water during the rinse, which is not what you want Dr Chemical on spa filter cleanerHmm. The TPP is a builder. In other words, its job is to dissolve calcium and magnesium minerals. So the other option you have is an acid of some sort. You could try vinegar, but it's probably not strong enough. If the filter has no metallic components I'd try Hydrochloric Acid - 1 part in 10 would be plenty strong enough. If it does have metallic components however, get some citric acid from the cooking aisle in the supermarket and soak it in a solution of that Dr Chemical on Dirt and dust under my patio roofSugar Soap. That'll loosen it Dr Chemical on Lead acetate in hair productsI've asked this question of them myself. I'm satisfied that it's not dangerous, based on the levels it contains and the bioavailability. If it was, we'd have heard about it before now. It's the same stuff that's in Grecian 2000, which has been around for years Dr Chemical on Citrus based cleanersyes - the active ingredient is d-limonene. It's a natural extract of citrus peel. Otherwise known as Orange Oil. It's a small, oxygen rich organic molecule (like acetone and isopropanol) so it interacts with organic stains but is still water miscible Dr Chemical on inflatable boat cleanerSugar Soap. Or if that doesn't work, oven cleaner - any one will do. Won't hurt the plastic Dr Chemical on Leather couch replenishI'd use neatsfoot oil. It actually comes from cows, so it's probably the most natural option Dr Chemical on Black deposits under the toilet bowl rimIt’s biomass of some sort. Spray some oven cleaner on it, leave it for a few minutes, and then you’ll find the brush will easily remove it Anonymous on Black deposits under the toilet bowl rimIt's biomass of some sort. Spray some oven cleaner on it, leave it for a few minutes, and then you'll find the brush will easily remove it Kiam on Toilet odour deodorisingI found spraying Glen20 (or the cheaper Coles brand) directly down into the bowl works well. Anonymous on inflatable boat cleanerIf you search for "mould" you should find something. Sam on Clean a caravan water tankAnd what about cleaning any 'muck'? Anonymous on mould in washing machinehttps://www.drchemical.com.au/questions/how-to-clean-my-washing-machine https://www.drchemical.com.au/questions/mould-on-washing-machine-door-seal Deb on BAM Easy off Spray for soap scum formula changeMake your own from Coles... https://www.drchemical.com.au/questions/sulphamic-acid Sue on Blu-tack in shorts pocket. What will remove it?https://www.drchemical.com.au/chemistry-at-home/stain-removal/the-best-spot-cleaner-on-the-market Harry on Citrus based cleanersIf you search for "citrus" in the search box this comes up... https://www.drchemical.com.au/chemistry-at-home/stain-removal/the-best-spot-cleaner-on-the-market Warren on Lead acetate in hair productsThis might help... https://www.fda.gov/cosmetics/productsingredients/products/ucm143075.htm Dave on Spider controlWhat about hair spray? Dawn on Oven cleaner is the best cleaner!Wow, that looks great! Terence on Blu-tack in shorts pocket. What will remove it?https://www.drchemical.com.au/questions/hardened-blue-tac-on-painted-wall Anonymous on Laundry Wash Balls using ceramic beadsAccording to this report they only work when used with specific purpose made machines... https://wcec.ucdavis.edu/wp-content/uploads/2016/06/150430-PBL-Report.pdf David on Choice reveal the best and worst household cleaning products of 2018Can you provide evidence that Choice "... test exclusively in Cold Water"? I can't find any public information saying that they do. https://www.choice.com.au/about-us/products-and-services/test-research-and-seminars#NATA%20accredited%20testing%20can%20help%20you%20register%20your%20products%20for%20sale%20in%20Australia Dr Chemical on Aspirin in the washingSounds like an urban myth to me. Asprin is acetylsalicylic acid - a weak organic acid. And given that washing detergents are alkaline, the tiny amount of asprin present would be quickly neutralized. I'd say there's a healthy dose of confirmation bias here Dr Chemical on Vomit on carpetPreen Vanish Carpet Foam should do it Dr Chemical on Water based Pot Sealant on CarpetHmm. Tricky. Get back to me with brand and any information on the label and I'll ask a mate of mine who knows a lot more about this than me Dr Chemical on What exactly is oven cleaner best for?Yep - all of the above except for protein stains, when you will need an enzyme cleaner (like Biozet). But you could also try sugar soap. The mechanism is the same but it's not quite as strong Dr Chemical on Oven cleaner is the best cleaner!Yep - the caustic soda saponifies the fat (turns it to soap) so it comes off easily Dr Chemical on Choice reveal the best and worst household cleaning products of 2018In general I don't have a very high regard for Choice reviews on matters such as this. The reason is that their testing protocols often don't have much connection with reality. An example is their testing of laundry detergents - they test exclusively in Cold Water. The consequence of this is that the cleaning agents in the premium brands that require at least warm water (enzymes and oxidizers) don't come into play. The consequence of that is they arrive at the absurd conclusion that Coles detergent outperforms OMO. On top of that they don't include products in their test that will do the job despite having the wrong labelling (because they just don't know any better). For example, the best laundry prewashes are alkaline-salt degreasers (like Kenco). Any alkaline degreaser (as opposed to solvent degreaser) from any auto accessories shop will outperform any laundry prewash Dr Chemical on Mould on liquid concreteNo. Use oven cleaner or any other source of caustic soda, and then mechanical action of some sort - hose, high pressure water cleaner. But you'll never get it all off limestone. Limestone is a rich source of carbon that cyanobacteria love for the purposes of making biomass, and it's not actually mould, so a biocide is a waste of time. You'll notice that limestone walls are blackest on the parts that get the most sun, not the least, as is the case with mould. Dr Chemical on cleaning sheep skin car seat coversSugar Soap Dr Chemical on Old urine stains on mattressYou tried Sard Oxy Plus? That might be tricky then. Try Preen Vanish OxyAction Gold. Spray on and leave it. If it doesn't work, try Preen Vanish Carpet Foam Dr Chemical on Lemon and honey drink on carpetPrren Vanish Carpet Foam. Follow instructions on the can. It's a good product Dr Chemical on dried dog urine from vinyl flooringSugar Soap Dr Chemical on Red wine stain on car carpet & polyurethane foamSpray some Preen Vanish OxyAction Gold onto it and leave it. Might need a couple of applications Dr Chemical on polishing alloy on bullbarBrasso. The best metal polish bar none for any metal surface Dr Chemical on mould in washing machineSpray some oven cleaner on and it will just wipe off Dr Chemical on Washing dog blankets & beddingUse a premium brand like OMO in hot water. If you wash in cold water you just aren't serious about getting things clean Dr Chemical on Will sugar soap or oven cleaner harm my leather reclinerNeither will, but the oven cleaner will have a drying effect on the leather and may dull the surface as it strips the oils out, and it will need to be replenished with neatsfoot oil or similar. Use the sugar soap Dr Chemical on Hardened blue tac on painted wallYou probably can't as it now probably adheres more strongly to the paint than the paint does to the plaster. But if anything will work, soak it in acetone somehow - perhaps a soaked rag held in place against the blue tac somehow. If you can leave it for half an hour it might help it peel away Dr Chemical on BAM Easy off Spray for soap scum formula changeReally? I hadn't noticed that. But I've got to say it doesn't surprise me. It happens a lot. Sulphamic acid is certainly the stronger of those two acids. I now recommend Ajax Spray and Wipe which uses lactic acid and has a better trigger mechanism than the Easy Off Dr Chemical on How much of this caustic soda do I need to make my own oven cleaner?a 5% solution is plenty. That's the concentration in Easy Off Dr Chemical on How Do You Get Diesel Off BitumenI have no idea what you're talking about. As far as I can see it's something to do with firefighting, and I can't see the connection with removing diesel from bitumen Dr Chemical on clean glass frameless shower screenUse Ajax Spray and Wipe Bathroom with a rubber squeegee. It'll do a much better job than bicarb and panty hose Dr Chemical on Sulphamic acidAbout 1-3% is plenty. It's the active ingredient in the Easy Off trigger-pack shower cleaner Dr Chemical on Yellow plastic preventionYes - the clear coat you add must contain UV stabilizers. If it does, then in principle, you can inhibit the yellowing Dr Chemical on Biro pen on silk blouseAcetone should shift it. Test on an inconspicuous part of the blouse first, but it shouldn't harm it. Put the acetone in a glass and repeatedly dip the stained area in and out and it will eventually all come out Dr Chemical on smell of smoke in wood furnitureNo magic solution for that I'm afraid, other than lots of air. The good thing is that smoke is not a persistent smell and should disappear pretty quickly with enough airing. Dr Chemical on smell of smoke in wood furnitureNo magic solution for that I'm afraid, other than lots of air. The good thing is that smoke is not a persistent smell and should disappear pretty quickly with enough airing Dr Chemical on Embedded stains on white and/or coloured shirtsTry an acidic cleaner as a prewash - Ajax Spray and Wipe for example. squirt it on, rub in and rinse. If that doesn't work, try sugar soap. If that doesn't work, Preen OxyAction Gold - spray it on and leave it - give the peroxide time to work. Might need to repeat. One of those should work. Dr Chemical on Oil on asphalt/bitumenGet some Kenco from Bunnings. Or get some caustic soda, sprinkle the flakes over the area (a 2 kg tub is probably enough). Wet it down with a minimum of water using a fine mist - just enough to wet the flakes. Then go over the area with a stiff outdoor broom, just rubbing the caustic in. Wait about 10 min and hose off. It won't all come off, but the beauty of bitumen is that it's an oil based product itself and it will all just soak in eventually Dr Chemical on kenco productsIt's in the tool shop Dr Chemical on Keeping my glass pool fence cleanThe mistake you have made is listening to Shannon Lush. Glass doesn't get cancer. And I wouldn't use a natural oil such as almond oil anywhere where it gets exposed to the sun as it will oxidise and degrade quickly, possible even polymerising (linseed oil) and making a gooey mess. Use an acidic cleaner such as Ajax Spray and Wipe to get dried minerals off. Then Windex with a squeegee to get a streak free clean (if you do it regularly you can skip the first step and just use Windex). Then Mr Sheen - that will coat it with silicone which will protect the glass against future mineral buildup Dr Chemical on laundry tub stainSugar soap should shift that. If it doesn't, try an acidic cleaner such as Ajax Spray and Wipe Dr Chemical on kenco productshttps://www.bunnings.com.au/kenco-5l-heavy-duty-auto-degreaser_p6101169 Dr Chemical on car tyre marks on light coloured car ceiling interiorGet some Kenco from Bunnings. Put it in a generic spray bottle and spray the effected area, then use a rag as a blotter. If that doesn't work, try oven cleaner using the same technique. It won't damage the lining Dr Chemical on Spider controlNothing that I'm aware of. Spider webs are pretty chemically resilient. Having said that, if anything will work it's oven cleaner, but you'd have to be careful with overspray Dr Chemical on Grease spots on polished concrete kitchen floorOven cleaner. It won't damage the floor Dr Chemical on Hair oil on upholstered lounge chairTry some Kenco (from the toolshop in Bunnings) Dr Chemical on Synthetic uppers white Nike shoesUse Sugar Soap. It's a good general-purpose, non-invasive approach Dr Chemical on Mildew in woodIf anything will work it's Sugar Soap. Spray on and rub in with a stiff brush. If that doesn't shift it try oven cleaner. This is the same approach but with a stronger chemical. Try a small amount on an inconspicuous section of the table first though, although I'd be surprised if it damaged the wood. If they don't work then I'm afraid you're out of options Dr Chemical on chemical with a pressure cleanerCaustic soda. But it works better as a pretreatment. Put a cupful in a 9L watering can, and sprinkle over the area in question. Leave for about 10 min then blast with the HP cleaner Dr Chemical on oil stains on fibreglass bathGet some Kenco from Bunnings (in the tool shop) Dr Chemical on Red dirt stainsNot much you can do about it I'm afraid. The red dust is essentially clay, which is chemically inert, so there's no quick spray on, wipe off option. But try sugar soap - that'll work as good as anything Dr Chemical on black algae on concrete blocksYes the pool algaecide might help. It certainly won't do any harm Dr Chemical on Zinc on polyester dressGet some Kenco from Bunnings, put it in a generic spray bottle and use it as a spot cleaner. Spray on, work in with your fingers and rinse Dr Chemical on Stains on outdoor canvas awningI need some more details. Do you know where the stain came from? What exactly does it look like Dr Chemical on Chewing gum on concreteNothing will dissolve it. If you can, get your hands on some dry ice. sit the dry ice on top of it until it freezes then bash it with a hammer and it should flake off. Having said that, if you sit an acetone soaked rag on it for a few minutes, that might cause it to peel away from the surface Dr Chemical on cleaning mesh screen doorSquirt it generously with Sugar soap, then hose Dr Chemical on stain on suede/leather shoeSuede is very difficult to clean simply because any water based product will leave a water mark behind. I'd try spotting it with a metho-soaked rag Dr Chemical on GEN-3 Ceramic Glasscoat ProtectionI'm not an expert in paints and coatings - it's a whole field of study on its own. But paints formulations have come a long way in the last 20 years, with lots of advanced coatings like this becoming available - so the claims are at least believable, but I couldn't say for sure. Dr Chemical on Silicon based lube on bed sheetsAcetone will probably do it. available from any hardware store Dr Chemical on Phosphoric acid in soft drink and tooth decayThis is how it works. Sugar is converted to glycoproteins, which coat your teeth and become plaque. Sugar then soaks into them, and deep into the plaque, and in contact with your teeth the environment is anaerobic. Under these conditions the sugar is converted to lactic acid. Lactic acid is a pretty strong acid and that's what dissolves the calcium phosphate that your teeth are made out of Dr Chemical on Poo stains and hot washesYou want warm water - optimum is 40 degrees with an enzyme cleaner (like Napisan) Dr Chemical on sealer stripperHmm. Tricky. My first thought would be to give it another coat. Or you could go into Crommelins in Welshpool, or Parchem, and have a chat to one of the chemists there. Stripping off paints or coatings isn't as easy as it used to be. But you could try a heat gun - it won't damage the sandstone Dr Chemical on Body Sweat on MattressI'd spray it with White King Stainlift Laundry prewash. Just spray it on and leave it. Might have to do it a few times. If that doesn't work, get some Preen Vanish Carpet Foam. Cleaning mattresses operates by the same principle as carpets Dr Chemical on Dye transfer on designer non-leather handbagIsopropanol is what you want. Go to an electronics store, and you can buy it in spray cans, as it's used for cleaning electronics (they call it isopropyl alcohol). Or you can buy it in a small pump pack from Bunnings, in the paint chemicals section Dr Chemical on Mould and dirtSugar Soap is what you want. If it doesn't get all the mould off use oven cleaner Dr Chemical on Stain on Silestone Quartz Kitchen BenchAcetone should get it off. It won't damage the stone Dr Chemical on Sterilise a kitchen wood cutting boardYes alcohol will do it. Spray some metho on, and after about 30s it's been sterilised. Dr Chemical on Deep Heat on clothingGo to Bunnings and get some Kenco. It's an alkaline degreaser. Use it as a prewash Dr Chemical on Stain on high gauge aluminium shower frameBrasso will do it. Or you can try Ajax Spray n Wipe Bathroom first Dr Chemical on Biro on leather sofaEasy. Acetone - available from the hardware shop Dr Chemical on Clouldy headlight coversUse Brasso. It works a treat. It requires a bit of elbow grease however. When you first start rubbing it will feel quite coarse, but as you rub it'll start to feel smoother - this means that the coarse, oxidised coating has been rubbed off Dr Chemical on calcium build up on bathroom tilesAjax Spray n Wipe will do it - it contains lactic acid that will dissolve the alkaline salts Dr Chemical on removal of mould on the ceilingOven cleaner - any one will do. Spray it on, wait a minute or so, and then wipe off with a damp rag Dr Chemical on Bore water stain in toilet bowlHydrochloric acid. It won't damage the toilet but will get the bore stains off a treat. Tip a bit in, give it a few minutes to react and see what happens. Add more as required Dr Chemical on What compound removes Tyre marksThere's no simple chemical you can spray on to remove it. The best you could do is to tip some xylene (paint thinners), white spirit, or turps onto it and let it soak, preferably at least overnight. This should loosen it, and make it easier to remove with a stiff broom or HP water Dr Chemical on Water stains IWhen you say that you have tried everything I presume that means you have tried the various bathroom cleaning products - Ajax Spray n Wipe and so on. These will do a good job of removing the alkaline salts of the soaps that soap scum is composed of. But sometimes when you do that, there's still stuff left behind, so called "water marks." These are insoluble mineral salts - probably Calcium Sulphate. The problem with this is that CaSO4 is highly insoluble and there's no chemical that you can spray on it that will dissolve it. There is, however, an option - razor blades. Get some of those single sided blades that can hold on the top without hurting your finger, and just scrape it off. I'm told it works well, and it won't damage the glass Dr Chemical on black leather mark on car roof interiorIt'll probably come out if you blot it with a rag soaked with metho. It will probably initially smear, but when you keep blotting it will eventually all dissolve into the metho Dr Chemical on Water SpotsIf by "water spots" you're referring to dried minerals, Ajax Spray n Wipe will work a treat Dr Chemical on Clean a caravan water tankWell if sterility is what you want you cant go past bleach. Get some from a pool shop (it's 12% whereas the stuff from the supermarket is about 4%). Dilute 1 in 3, put in a generic spray bottle and spray liberally onto the internal wall. Then rinse with copious amounts of water until the smell is gone Dr Chemical on Terrazzo floorI use a brand called Long Life from Bunnings. It cleans and polishes Dr Chemical on Acrylic bathtub stainsMetho on a rag will do it Dr Chemical on Yellowed plastic ceiling ventsCan't I'm afraid. They've oxidised over time with UV light Dr Chemical on Your new book titleThanks for the idea I like it Dr Chemical on children’s paint spilt on leather couchMetho should get it off Dr Chemical on Possible Book TitleI like the second one. Preen used to be called "The Great Unstainer" and it was a very successful campaign Dr Chemical on Iodine stain on bedspreadWell, the chemical you want is sodium thiosulphate, which will work a treat. But as it is not exactly available off the shelf, try blotting it up with metho on a rag. It should come out eventually Dr Chemical on calcium stains on shower glassAjax Spray n Wipe Bathroom. If that doesn't work , razor blades - you won't damage the glass Dr Chemical on Removing engine oils stains from paversTrouble is that the pavers are porous. If anything will work, get some general purpose grey cement powder, sprinkle fairly generously on the stain then wet it. Let it dry, and hopefully as it dries some of the stains will wick up into it. Then it will just brush away. As it's only cement powder and not concrete it won't set hard. Dr Chemical on Suncream stainsTry acetone. Dip the offending part into it a few times. Either that or Kenco (from Bunnings) - use it as a prewash or spot cleaner Dr Chemical on title for bookVery clever Dr Chemical on White rice and Brown RiceSure thing. I'll get back to you Dr Chemical on tea stain on leatherTry sugar soap used as a paste. That should shift it Dr Chemical on Fly poo on lamp shadeTry Sugar Soap in a trigger pack. It's pretty good for stuff like that Dr Chemical on Surface rust on stainless steelYep. Get a product called Gelimac from Bunnings. Rub in with a stiff scourer Dr Chemical on plastic black-handled knivesThat's a tricky one. Not sure what that'd be - evidently the plastic is degrading somehow. For no particular reason I'd try oven cleaner. Spray it on, rud in with a gloved hand and rinse off. If that doesn't do it, try some clear lacquer from Bunnings. Hopefully that'll seal the surface. Dr Chemical on Old bile stains on carpetI'd try oxidising that. Hit it with some Preen OxyAction. Just spray it on and leave it. Might have to repeat a few times. Or White King StainLift. Same deal - just spray it on and leave it Anonymous on Is Glen 20 safe to breatheWould you breathe it when you go to bed ?. Dr Chemical on Baby urine on knit type rugVanish Powerclean Carpet Foam should do it. Or White King Stainlift laundry prewash will probably work too.... Dr Chemical on brass platesYes - Brasso is the best metal polish on the market Andrew BRUCE on Clean acrylic windowsBrilliant suggestion the Brasso has done a fantastic job of removing the built up oxidation and restored clarity to my rearward vision . several stages will be needed to clear small scratch marks , other than that great advise for a simple solution, Also used the BRASSO restore the wing mirror black plastic housings and other exterior oxidized black plastic surrounds. Was suggested that "smooth" peanut paste would be an alternative suggestion as a cleaning non abrasive option. I will try the peanut paste to remove scratches along with Brasso. Great solution to a problem thank you Dr Chemical on measuring densityFill a container with water to the brim. Then put it in a saucer of some sort so that any overflow will be caught. Weigh the solid object. Then place the solid material in the container so that it overflows into the saucer. Then remove the container and measure how much water has overflown (either by weight or by volume). The density is then the weight of the solid divided by the volume that overflowed. So if the solid weighed 200g, and 100mL (or 100g) ow ater overflowed, the density is 200/100 = 2g/mL Dr Chemical on Dog stains on carpetCan you describe the stains? Do you mean stains from its coat? Dr Chemical on Mould on Washing machine door sealSpray with oven cleaner and wipe off Dr Chemical on urine smell on track pantsSpray them with White King Stainlift laundry prewash. The enzymes should take care of it Dr Chemical on Old silver cutleryGet a tin foil pie tray. Fill it with water and sprinkle a few tablespoons of salt in there. Then just drop the cutlery in and watch the tarnish disappear before your eyes. There's some youtube vids of this, but they use baking soda and hot water. Table salt will work better and cold water is fine Dr Chemical on dog oil on walls & woodworkTry Sugar soap. If that doesn't work (it probably will) oven cleaner Dr Chemical on How to clean a Panasonic tv screenMethylated Spirits will do it. Anonymous on Mould on Washing machine door sealhttps://www.drchemical.com.au/questions/how-to-clean-my-washing-machine Dr Chemical on Pen on light pink faux leather jacketHmm Tricky. Rubbing alcohol is isopropanol which is what I generally recommend for this, but if it's de-pinking it, then you might want to try Orange Power Sticky goo and Spot remover (from Supermarket). Acetone will work, but will probably remove more pink than the rubbing alcohol Dr Chemical on laminate floorsAmmonia works well. Half a cup in a bucket of water Dr Chemical on Killing mouldWell yes it kills it, but it will come back, simply because the damp conditions that promoted its growth in the first place exist. And yes both caustic and non-caustic will work Dr Chemical on Fabulon stains on white cottonHow long after spraying did you iron? Fabulon contains a silicone emulsion (like Armor All) and starch. It separates into layers in the can, and that's why it has to be shaken before you spray. If you spray it and then wait a while before you iron it will separate out and you can get stains from the silicone. But it should wash out with a premium laundry detergent. Dr Chemical on Grease stain in cotton overallsGet some Kenco from Bunnings and use it as a degreaser Dr Chemical on Paint on carpetSoak with acetone on a rag. It should peel away Dr Chemical on Are iron woks safe for cooking?They're perfectly safe. People have been cooking with cast iron pans for years. In any case iron is an essential element. Our bodies are full of it (in our blood) Dr Chemical on Safe cleaner for leather loungesTry Sugar Soap. It's essentially washing soda so that should do the job. If not, non-caustic oven cleaner. If it's a little dull afterwards, replenish with either Dubbin or Neatsfoot oil Dr Chemical on rust on car paintworkCoke contains 5% phosphoric acid so it has some efficacy, but Ranex will be better Dr Chemical on rust on car paintworkGet a product called Ranex from an automotive accessories shop and rub it on. Dr Chemical on Clean acrylic windowsIf anything will work it's Brasso. Rub it across liberally until you feel it turn from coarse to smooth Dr Chemical on Headlamp cleaningUse Brasso. Put it on a rag and rub over the plastic. You'll feel it to be coarse at first, but as you rub and rub it will become smoother. You'll be amazed at how well it works Dr Chemical on Remove labels from jarsAcetone Dr Chemical on superglue on coatSoak it in acetone and it will eventually peel off. But spot test first on an inconspicuous part of the coat Dr Chemical on Smoke stain on Weber q barbecueOven cleaner. Spray on and it will wipe off Anonymous on Are iron woks safe for cooking?Can you show us the link to this claim? Anonymous on how to clean oil stain from my pavers?https://www.drchemical.com.au/chemistry-at-home/cleaning-hard-surfaces/oil-stains-on-cement-driveways Anonymous on rust on car paintworkTry coke soft drink Wayne Wallis on Safe cleaner for leather loungesMy leather recliner has gradually, over the last 20 years, developed a dinner plate sized stain on the head rest. I originally thought it liked rustic to fit in with the leather which is very natural looking and soft textured. I have used leather cleaning products but the stain doesn’t lighten and looks even darker after l’ve finished. Thanks for any suggestions you may have. Allie on How to clean my washing machineHi Dr Chemical, Can this be any kind of oven cleaner or should it be non-caustic? TIA Anonymous on laminate floorsWarm water with a bit of detergent. Anonymous on Grease stain in cotton overallsOven cleaner Anonymous on Fabulon stains on white cottondisodium tetraborate decahydrate = borax = https://en.wikipedia.org/wiki/Borax Anonymous on Fabulon stains on white cottonAccording to the msds... Butane propane Isobutane disodium tetraborate decahydrate Anonymous on Fabulon stains on white cottonI believe the component of the Fabulon spray is Silicon Oil to help the iron glide. I have used washing up liquid but that doesn't work. Still looking for a solution. David on Paint from a brick wallhttps://www.bunnings.com.au/poly-2l-polystrippa-paint-stripper_p1715090 Bel on Grime on Sink Join BenchtopGreat thanks guys!! I will test both this weekend. Appreciate it 🙂 Anonymous on Brown rusty coloured stain on jacketWithout knowing what it is, there's a bit off guesswork. I'd try some Kenco from Bunnings, used a prewash. Squirt it on liberally. If that doesn't work, White King Stainlift laundry prewash. Dr Chemical on Hollandaise sauce stainUse some White King Stainlift laundry prewash. Spray on, rub in with your fingers, then leave for about 10 minutes and wash out. Rubbing with your fingers is important as enzymes are temperature specific in their operation and they work best at body temperature. And switch to a warm wash with Biozet attack (40 deg) - you'll be amazed at how well it works - cold water is useless Anonymous on Shower floor tile stainingProbably mineral build up. Hit it with some sulphamic acid. BAM Easy Off is the stuff you want https://www.woolworths.com.au/shop/productdetails/252241/easy-off-bam-power-bathroom-cleaner-grime-soap-scum Anonymous on How to waterproof tile groutIt essentially already is waterproof. If you're trying to stop the dirty buildup on the grout there's not much you can do about it - it's just fat off your skin. Having said that, if you wanted to make it a smoother surface that'd be easier to clean, there are gloss finishes you can get for sealing slate that would do the job. Just look for "slate sealer" in the hardware store Anonymous on Brasso on carpetWell, the good news is that the stain is purely physical. That is, you've essentially got powder embedded into it. There's no chemical way of removing it - it needs to be sucked out somehow. You might need to hire on of those industrial strength carpet cleaners from Bunnings or something, but if you have a good quality vacuum cleaner it will eventually come out Anonymous on how to kill cockroachesAs well as the above it's also essential you eliminate any food sources for the cockroaches (especially in cupboards. Crumbs and food scraps (no matter how small) will keep them coming in. Anonymous on bore water stain showerits like a rusty tinge on the tiles it even sends blonde hair brownish Anonymous on Brown rusty coloured stain on jacketWhat caused the stain? Anonymous on Oil on brick pavingTry Richard's Greasestripper. Go to greasestripper.com.au The powder is just brilliant. Also brilliant on rangehood vents. Anonymous on Remove pin from wrong side of earingIf anything, acetone. Available from any hardware store. soak it for a while and it should come apart Anonymous on Oven cleaner to remove mouldWhen I said "don't use the foam" I was referring to Mr Muscle. It's a great cockroach killer but not as good for general cleaning as it doesn't cover a wide area Anonymous on Oil on brick pavingYep Anonymous on How do I get grease out of a linen bedspread?Get some Kenco from Bunnings. use it as a prewash and it will shift the grease Anonymous on Smell of formaldehydeAir, air and more air. Just put it outside for a week or two and the smell will eventually dissipate. Having said that, none of the things you tried will work anyway. If anything will wash it out, it's a premium brand like Biozet Attack in warm water (40 degrees) Anonymous on white bore stains on brick wallsIf anything will work, hydrochloric acid, about 1 part in 3. It will remove any carbonates, but not any sulphates (which may be efflorescence from the bricks themselves). Put it in a generic garden sprayer and spray on. It will eventually destroy the trigger mechanism in the sprayer but will last long enough to do the job Anonymous on Oil on brick pavinghttps://www.drchemical.com.au/chemistry-at-home/cleaning-hard-surfaces/oil-stains-on-cement-driveways Anonymous on Grime on Sink Join BenchtopDon't use bleach use oven cleaner. Lindsey on Grime on Sink Join BenchtopTry Domestos - fabulous product. Leave for a couple of minutes. Use toothbrush or satay stick to help dislodge grime. Should the black/mould be under silicon you will need to cut the silicon out, remove mould and then re-silicon. Diane Gill on Is Glen 20 safe to breatheHave a sick baby in hospital with HFMD. Is it safe to spray the house with glen 20 Anonymous on perspiration stain on silk topThanks Doc. I tried your method twice and it helped a lot. The stain has faded but is still visible. Following the treatment I washed it both times with Softly and air dried it. Dr Chemical on Remove mould stain caravan awningSpray oven cleaner on and just wipe off Dr Chemical on ink on shirtSour milk? Where did that idea come from? How extensive are the stains? Dr Chemical on bore water stain showerCan you describe its appearance? Dr Chemical on how to kill cockroachesBest genral approach is a bomb (fogger). Follow the instructions on the can and it'll do a good job of eliminating (or minimising) their prevalence. If you're in a block of units you'll never kill them all Dr Chemical on cleaning the patio roofIf it's just general grime any alkaline cleaner will work, such as any oven cleaner, or a solution of caustic soda. A cupful in half a bucket of water is plenty, wet a rag and wipe it Dr Chemical on Fat stains on leather handbagOr an alkaline automotive degreaser will also work (such as Kenco) Dr Chemical on Fat stains on leather handbagA non-caustic oven cleaner will do the job. Just spray on and wipe off Dr Chemical on Does oven cleaner come in a hand spray bottle?No, but it's easy enough to make - it's only caustic soda. You can get some caustic soda from the hardware store, and half a cup in a litre of water in a spray bottle is plenty Anonymous on Remove concrete splatter from a zinc alum shedThanks I'll give it a try. Anonymous on DIY shower cleaner with phosphoric acidCan I use this with a septic system? Dr Chemical on Stains on door runners from millipedesOven cleaner should shift it. If it doesn't, try Ajax powder Cleanser Dr Chemical on Dog poo on carpetI'd try Vanish Carpet Foam. It's a good product Dr Chemical on perspiration stain on silk topTry White King Stainlift Laundry Prewash. use it as a spot cleaner. Spray on, leave for about 30 min, then rub with your fingers and rinse out. Let me know how it goes Dr Chemical on Remove concrete splatter from a zinc alum shedGood question. I'd normally recommend hydrochloric acid, but that'll probably attack the zincalume. So get a heat gun. Heat the area, and because the metal and cement expand at different rates it should dislodge and you'll be able to brush it away Dr Chemical on remove food dye from skinIt's probably all dissolved now, hasn't it? It's only temporary anyway. Dr Chemical on shoe polish on carpetAny solvent will get it out - turps, white spirit, shellite etc. All available from the hardware store. Pick the one with the least smell Dr Chemical on bath soap residueYep WD40 would work. Or you could spray some Ajax Spray and Wipe Bathroom down it - that will dislodge any soap residue. If you're getting the same buildup in your piping, I'd be using any pH reducer from the pool section in bunnings (usually sodium bisulphate or biphosphate). This will provide the acidic conditions required to break up the residue.. Just dump a tub of it in the spa and run it for a few hours Anonymous on shirt underarm stainYou mean this? https://www.bunnings.com.au/kenco-5l-heavy-duty-auto-degreaser_p6101169 Dr Chemical on Paint from a brick wallBunnings sell a paint stripper that uses dichloromethane as the solvent. I forget the brand but that's the stuff you want Dr Chemical on shirt underarm stainWhite vinegar, bicarb soda, tea tree oil all sound like Shannon Lush solutions. Get some Kenco from Bunnings and use it as a prewash. Let me know how it goes Dr Chemical on How to get mould out of fabricCan't be done. I had the same thing happen on a light-coloured pair of jeans. I tried everything I could think of but nothing worked. The trouble is that it gets right into the fabric. With time, however, it has faded somewhat... Dr Chemical on How to prevent certain plastics from turning yellow.The problem is that it's not UV-stabilised plastic, and yes - it's the UV light that causes the yellowing. So the only way that I know of is to regularly apply SPF50 sunscreen.... There may be a clear spray you can spray on that contains UV stabilisers, but I don't know of any off the top of my head Dr Chemical on Vinegar in rinse cycleCould be. Laundry detergents are alkaline and vinegar is acidic, so it'd do a good job of removing any residues Dr Chemical on Mould on camper trailerYep - if anything will work, that will Anthony The Koala on How to prevent certain plastics from turning yellow.Dear Dr Chemical, Here is a site that discusses methods using chemicals containing H2O2 to de-yellow plastic. It mentions UV light from the sun causing the yellowing. https://www.thegeekpub.com/13216/how-retrobright-works/ Again I still would like to know if there are other causes of yellowing of plastic other than the SUN's UV. Thank you Anonymous on Sticky dots on windowTry acetone Anonymous on Mould on camper trailerOven cleaner Anonymous on DIY shower cleaner with phosphoric acidGreat thanks. Dr Chemical on grime on wooden drawersNope Dr Chemical on DIY shower cleaner with phosphoric acidYou can use it as concentrated as you want. Phosphoric acid is a weak acid - Coke contains 5% phosphoric acid - that's how it cleans coins. Dr Chemical on Iron buildup in toilet bowlsThe simple solution is hydrochloric acid if it's in your toilet bowl. Harpic used to make a product that was thickened hydrochloric acid but they've taken it off the market now. You can use as much as you want on ceramic - just tip it in and let it do the job. If it's in a sink where the acid might dissolve metallic components, go to Bunnings and get a product called Gelimac - it's oxalic acid, and will do the job nicely (although not as quickly as the hydrochloric) Anonymous on Iron buildup in toilet bowlsThis might help... https://www.drchemical.com.au/chemistry-at-home/how-to-remove-water-stains-from-toilet-bowls-or-water-purification-made-simple Anonymous on Cleaning dirty wallsWould oven cleaner work? Or would it damage acrylic wall paint? Terry on grime on wooden drawersWill it damage the varnish on the wood? Anonymous on Candle wax on suede shoesWhat about sticking them in the freezer and letting the wax flack off? Tim on Toilet odour deodorisingAnd is it true the smell is actually tiny pieces of poo floating through the air? Dr Chemical on Beetroot shirt stainAny acidic product will get it out. Vinegar, or any hard surface cleaner with an acid as the active ingredient (Spray & Wipe uses lactic acid for example) Dr Chemical on shirt collar stainIf it's grimy marks from your skin (fats), oven cleaner as a prewash will work well. A more general approach would be to use white king stainlift laundry prewash Dr Chemical on Cleaning dirty wallsYes - sugar soap is a good option. it's essentially washing soda, which will do a nice job of stripping the grubby fingerprints off Dr Chemical on How to clean my washing machineOven cleaner. Spray it on, wait 30 seconds or so and it will wipe away Dr Chemical on smell of dog urine on concreteVinegar should work as the smell comes from the amines, and the acetic acid (vinegar) should neutralize it. If it doesn't, spray some White King Stainlift laundry prewash onto it, and let the enzymes take care of it. Last resort, 1 part in 10 hydrochloric acid Dr Chemical on White towels turning greyblackWhat brand laundry detergent do you use? And what is your nrmal wash temperature. A short term solution would be to soak them in Vanish Gold Oxi-Action Dr Chemical on Magpie poo on paving bricksSprinkle some caustic soda on, wet down with a minimum of water, then scrub in with a stiff broom or brush. Wait half an hour then hose off. May need to repeat Dr Chemical on grime on wooden drawersEasy. Oven cleaner. Spray on, wait about 30 sec and then wipe off. It won't damage the wood Dr Chemical on sweat stains on suede leather couchSuede is very hard to clean, as almost anything will eave a mark behind. All I can suggest is wiping the areas with some metho on a rag Dr Chemical on Candle wax on suede shoesSuede is very, very difficult to clean as it's hard to apply any cleaning chemical without leaving water marks behind. All I can suggest is blotting it with some acetone on a rag. Acetone is available from any hardware store Dr Chemical on Is Glen 20 safe to breatheYes it's perfectly safe. There is no correlation whatever between how bad something smells and how toxic it is. Many people have overdone it with bleach, for example, and come out of the bathroom coughing and spluttering. The bleach has acted as an irritant and nothing more. Deadly cyanide gas, on the other hand, has a very pleasant almond smell. Pete on White towels turning greyblackRead through the owner's manual too. Mine suggested putting a cycle through with a packet of magnesium sulphate. I bought a packet from my local pharmacy. Wendy on White towels turning greyblackHi Pete thanks for your reply. Will try a 90deg wash more often. Dont think its a fault with the machine as a friend purchased a different brand front loader washing machine and she is having the same problem as me (several months down the track too). Pete on White towels turning greyblackhttps://www.drchemical.com.au/questions/how-to-clean-my-washing-machine Pete on White towels turning greyblackIt sounds like it might be a problem with the washing machine. Make sure you do a 90° wash at least once a month to kill the germs as a normal 30-40° wash isn't hot enough. Michelle on shirt collar stainTry using Carbolic soap or fairy washing liquid my son works as a labour and he comes in with oil stains on his white t-shirts I use Carbolic soap and washing liquid leave for 3/5 mns then put it in washer Michelle on smell of dog urine on concreteI have used everything from bleach to vinegar to jays fluide to try and get rid of smell of dog urine from my backyard I clean it 3 times a week but nothing helps Terry on Cleaning dirty wallsWhat exactly is sugar soap? sally on shirt collar stainI think i read somewhere here that oven cleaner works well?