I have used several products that contain oxalic acid. Some are boat type products ($$$) and some are household type products sold for cleaning fiberglass bathroom fixtures. They all seem to work equally well for me. steve Steve R. M-15 #119 Lexington, KY ******************************************************************* I noticed that dirt/dark particles collect very quickly on the boat's surface (especially non-sticky parts). What do you all use to clean the deck/cockpit? How do I get rid of these dark specks on the non-sticky surface? Thanks for your help! Donglai M15 #612