This reply may be a bit too simple, but it may bring some help.
I always sufered from a very slipery floor on my V20, it was way dangerous. Well, I actually bought a sand color epoxy floor paint with texture to eliminate the slipery deck. I started cleaning the floor with sandpaper ( light grit ) and paint thinner ( 1000 ). I could not paint the deck that same day, so I planned to paint next day. Next morning, when I went to continue on the paint job, the deck looked so clean and dull, that I decided to give it a try on the next ride to see how much grip it had then. Well, it works so good, that I decided not to paint it, what I do now is every once in a while, I soak a white small towel with thinner 1000 and wipe the deck, IT JUST SIMPLY WORKS !!!
I guess that the soap I use to wash my boat, which has Carnauba Wax, of course it does leave it looking good, but when this wax mixes with sea water, it becomes like soap. Now every time I wash the boat, at the end, I scrub the deck with Dawn Original Blue dishsoap, and when it dries, use the paint-thinner wipe. PROBLEM SOLVED.
I hope it can help someone.