FSR from West Marine. FSR is 'Fiberglass Stain Remover' and is a blue paste that comes in a plastic jar w/ white top. Rub in with a scrubbie brush and let sit for a few minutes, then rinse off. Caution, if you have a cut/scrape on your hands it will let you know where you need the band-aid! LOL - Acid based cleaner, works well on stains.
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