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You want to use Starbrite "Non-Skid Deck Cleaner". This is the BEST product for cleaning non-skid. It literally melts the dirt away. Wet floor, spray or pour on, spread around, let sit for a minute, and scrub. It also cleans whaler upholstery well . I think Attwood also makes the same product.

If you have stubborn stains from leaves and other tannin stains, liquid "Instant Hull Cleaner" should work. This product also cleans off yellow hull staining. It is oxalic acid based.

Use only liquid products for cleaning your Whaler. Products with abrasives, like the first three Phil mentioned, in MY opinion should never be used, as they will scratch and dull the gelcoat. Products with bleach should also never be used.

Whaler's website will confirm what I am telling you.