We're in a fresh water environment with very warm, humid summers. Mold or most likley mildew spots in the nonskid is an ongoing problem for us. I've tried a bunch of cleaners, including the starbrite with PTFE, with mixed success. The one I'm using now is the Woodywax boatsoap. It claims on the bottle that it removes mold/mildew spots and it does follow through with regular washing. That said, if we neglect it and it gets really bad, we wind up using Tilex mold and mildew with great success (safe for fiberglass shower surrounds), but it will remove any wax. We then follow up with the Woodywax soap, and finally with a coat of woody wax itself to prevent further stains. YMMV.
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