Meguiar's M77132 Heavy Oxidation Scrub Quickly removes heavy oxidation from gel coat, fiberglass, and non-skid surfaces Water-soluble formulation rinses easily with water Excellent solution for surface preparation removing chalky oxidation, staining, rust, and mold to allow for optimized gel coat restoration No machine needed, simply apply light to medium scuff pad or soft to medium bristle boat brush, rinse off with water, and wipe dry Biodegradable detergents