Boat Bottom Cleaner. Removes deposits on boat bottoms, scum line and rust stains quickly and easily. Features:- Removes deposits on boat bottoms, scum line and rust stains quickly and easily.- Water based, environmentally friendly, biodegradable formula.- Special patented buffering process makes this product safer than other acid based bottom cleaners.- Safe for use on fiberglass, metal, wood and stainless steel surfaces- Also great for removing rust stains- Begins working on contact- Ideal for removing marine deposits from inflatable boats and RIBs