Star Brite Boat Bottom Cleaner removes deposits on boat bottoms, scum line and rust stains quickly and easily. 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 fibreglass, metal, wood and stainless steel surfaces. Great for removing rust stains. Begins working on contact. Ideal for removing marine deposits from inflatable boats and RIBs. 950 ml.