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I recommend Starbrite's Non-Skid Deck Cleaner. I've tried them all and this is THE best. It dissolves dirt easily, and is also great for cleaning tan pleat upholstery. You can also use the Attwood brand, or other brand carried at Walmart for a little less money. For tar or heavy grease on the floor, use mineral spirits first.

Abrasive cleansers like Soft Scrub (a highly misleading name) should NEVER be used on any gelcoated surface. It will quickly scratch, remove the gloss and dull the surface.