Quickly remove black streaks caused by water runoff.Unique formula utilizes chelating agents that break the bond between stains and painted or fiberglass surfaces. Spray it on, let it work, then rinse away the black streaks. Begins working on contact to eliminate black streaks under rubrails or anywhere else on the boat.Key FeaturesSafe for use on fiberglass, metal and painted surfacesWill not remove wax or polishSpray directly onto black streaks and wipe off; no hard scrubbing needed