Starbrite Boat Bottom Cleaner The Starbrite Boat Bottom Cleaner cleans boat bottoms, removes marine deposits, ad whisks away scum line quickly and easily. This cleaner is safe for use on fiberglass, wood, iron, and painted surfaces. Formula is water-based, environmentally-friendly, and biodegradable. Starbrites Boat Bottom Cleaner is also ideal for removing marine deposits from inflatable boats and RIBs. Starbrite Bottom Cleaner is easy to use and begins working on contact. Features 32 oz bottle