TotalBoat White Knight Fiberglass Stain Remover Removes dirt, exhaust, oil, rust, scum, & waterline stains from fiberglass gelcoat surfaces Non abrasive gel formula cleans deeply & lifts stains without damaing gelcoat No scrubbing or compounding required. Let sit for 10-15 minutes and rinse Use on boats and RVs, shower stalls, fiberglass furniture,whitepainted surfaces & stainless steel 16 oz jar. Made in the USA.