Cleans boat top to bottom. Safe for use on all washable surfaces including hardwoods, brass, chrome, canvas, fiberglass, plastics, even delicate fabrics and skin. Quickly penetrates and lifts grease, blood, ink, fish oils, diesel fuel, mold, mildew and bird droppings from bilges, decks, canvas, galleys, heads or any washable surface. Contains blend of synthetic, high-grade penetrants activated by water. Can be used with fresh or salt water.