Clean the dirtiest of hulls, removing water lines, scum lines, fish blood and stains. The powerful marine-grade ingredients are engineered to remove tough stains in a single application. Not for use to remove rust stains. Just spray on, let it remain on the surface for two minutes and rinse off with fresh water. Can be used on all surfaces: Fiberglass, Plexiglas, Vinyl, Metal, Glass, Plastics, Rubber, Painted Surfaces, Pre-Waxed Surfaces, Carpets, and Decals.