Black Streak Remover begins working on contact to eliminate black streaks under rub rails or anywhere else on the boat. In addition to being the best way to get rid of black streaks, this product is a great all-around cleaner for all marine surfaces. Ideal for use on fiberglass, metal, plastic, rubber, vinyl, or painted surfaces. Formula will not remove wax or polish. Easy spray on/wipe off application. No hard scrubbing required.