lichen on clay roof tiles and timber

I have Lichen growing on my clay roof tiles and timber battens under my pergola.
I was hoping you can advise a product to use which does not contain chloride as I believe chloride may damage the clay roof tile coating and is no good for gutters

many thanks
Wayne

29812cookie-checklichen on clay roof tiles and timber

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Dr Chemical

By “chloride” do you mean bleach? You will find that oven cleaner will remove it effectively. If it’s a large area get some caustic soda from Bunnings and make it up at about a 10% solution in a generic Garden sprayer. Spray on, leave for a while, and it should just hose off.