I keep a sailboat on a warm, dirty and extremely fertile lake in central Illinois - the waterline scum that builds up is as tough and nasty as anything I might find on the TM. While I have tried bleach and products specifically designed to remove waterline stains, I've had my best success with "The Works" tile and bathroom cleaner which seems to be available at most local grocery stores. I suspect it would work on mildew but you might try it first on a small area to make sure it gets along with silicone. (As a bathroom cleaner it should.) - camp2canoe
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