32 oz. RV Black Streak Remover If you’d rather relax than scrub stains, this cleaner/degreaser belongs in your cleaning supplies. It powers away stubborn black streaks caused by window and door sealant and roof coatings. Use full strength on black streaks, grease and oil stains, tree sap, tires and wheels, grills and other heavy duty cleaning. For other household cleaning jobs, dilute it with water. Full timer’s choice RV care is part of Camco’s commitment to offer products effective enough to use by the most hard-core group of RV’ers on the road today…Full Timers.