You can soak it in bleach, power wash it, acetone it and nothing will work, believe me. Get yourself a plastic putty knife (to scape off the excess) and some 3M polishing compound and have at it. Then get rid of any wood mulch you have near your boat or move your boat. The fungus is directed towards bright objects so a nice white boat is a perfect target. The longer it sits on the surface the harder it is to get it off.
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