The Star Brite Instant Hull Cleaner removes waterline and rust stains from all wakeboard boat hull surfaces. The simple wipe on and rinse off formula makes cleaning your hull quick and easy. The Hull Cleaner contains no strong acids or harsh chemicals. Although the formula is strong enough to discolor some antifouling bottom paints so take precautions to prevent contact. The Starbrite Hull Cleaning product is much safer to use and less aggressive to your hull than competitive acid based bottom cleaners.