Fiberglass Stain Remover, is a unique stain absorbing gel. Ideal for removing oil, rust, exhaust, waterline, and transom stains yet it can also be used anywhere else fiberglass stains may crop up - shower stalls, furniture, etc. Removes road soil.Non-abrasive. Requires no sanding or compounding. Simply apply with a brush, sponge, or cloth, wait a few minutes, then wipe off.