The #1 hull cleaner and strongest formula available. Marykate On & Off Hull & Bottom Cleaner works instantly to clean and remove the toughest waterline stains, barnacle & algae stains, and rust & exhaust stains. Easy to apply- just bursh it on and rinse it off! Will not harm gelcoat. For use on fiberglass only. Not for use on metals or painted surfaces. Protect metal surfaces from vapors.
