Brush or spray on, allow 5 to 1 O minutes in ambient temperature, then rinse it off. For use on fiberglass only. Easy to use and works instantly. 

This is a buffered acid cleaner. Formulated to ease End-of-the-Season haul out cleaning. Removes waterline stains, algae stains, rust and gas exhaust stains. 

Excellent for Great Lake applications and barnacles.