Meguiar's M6732 One Step Compound, 32 oz liquid. Aggressive Cleaner Plus Polish, 32 oz. This advanced aggressive, yet safe compound will clean and restore gloss to the gel coat surface in one step. Removes moderate-heavy oxidation, scratches, stains and tough water spots on all fiberglass and painted gel coat marine or RV surfaces. Restores color and leaves a rich gloss on the treated surface. Incredible results by hand or machine.