Full Timer's Choice Black Streak Remover is a specially formulated cleaner/degreaser that powers away stubborn black streaks caused by window and door sealants and roof coatings. Safe for use on all surfaces, Black Streak Remover is also a multipurpose cleaner that safely removes grease, bugs, tree sap and other hard-to-clean stains. Use full strength on heavy-duty cleaning jobs. Dilute for other cleaning jobs. Priced each.