Collinite No. 920 Fiberglass Boat Cleaner is a mild-cut compound that removes dirt, film, light oxidation, discoloration, oil, grease and tough stains from fiberglass boat finishes. Use Fiberglass Boat Cleaner to smooth the surface, restore the original color, and enhance the appearance of neglected fiberglass. Gel coat finishes cleaned with Collinite Fiberglass Boat Cleaner are smooth and properly prepped for an application of wax. The wax spreads thinner, is easier to apply and it bonds to the surface better too.