Patented. Cleans anything on a boat from fiberglass and wood to vinyl, canvas and metals. Contains no phosphates and is biodegradable. Based on proven hydrotrope formula that permits faster emulsification of dirt, grease, grime, algae and mildew. Concentrated. Leaves clean pleasant fragrance. Works with fresh or salt water. Completely harmless to painted or varnished surfaces, both above and below waterline. Can also be used to clean fish and bait wells.