Star Brite boat hull cleaner features a gel formula that clings to vertical surfaces for maximum cleaning power. This instant hull cleaner removes rust, tannic stains, scum lines, and waterline discoloration from fiberglass and painted surfaces. The 22 oz. spray bottle makes application easy - spray, wait, and rinse. Safe for year-round use on fiberglass hulls.Gel formula clings to surfaces for deeper stain removalRemoves rust, tannic stains, scum lines, and waterline discolorationSafe for fiberglass and painted surfacesNo scrubbing required - spray on and rinse offAvoid contact with fabrics and anti-fouling bottom paint, as the product may cause discoloration22 oz. bottleMade in the USA