Bio-Kleen M00507 Black Streak Remover, 32 oz. Allows you to remove those black streaks and stains from boats, trailers and RVs with ease Just spray it on and wipe it off, it's that simple! A multi-purpose cleaner/de-greaser designed to remove soils and marks with a minimum effort on a wide variety of hard surfaces Leaves surfaces streak-free and sparkling clean No rinsing needed and residue free