Mildew in wood

I’ve got a timber table under cover outdoors but gets a bit of moisture still. The wood has black mildew in it, I sanded a section (polyurethane coating) and the mildew has gotten under the coating. Any way to treat? I want to sand and coat with marine varnish if I can get rid of the mildew without bleaching the wood.

24860cookie-checkMildew in wood

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