Our instant hull cleaner cuts through built-up dirt, grease, grime and sludge on contact, simple apply using a sponge or sprayer, allow to sit for 2 minutes and rinse off to remove stubborn new and old stains from a water line, fuel, gas, exhaust, fish blood and more. Our fiberglass boat cleaner is also safe for an aluminum hull, gelcoat, metal and painted surfaces, removing stains and discoloration restoring your boat to a bright white making it look new again. We proudly stand behind the quality of all our products! We are a family owned American business committed to making premium quality products. MADE IN USA