REMOVES BLACK STREAKS, FILM, GRIME & MAGNETIC DUSTRV ROOF & BLACK STREAK CLEANER is a non-acid, high alkaline formula that removes black streaks, road film, grimebuild-up and magnetic dust. Dilute with water up to 300:1!!! Simply use 1-2 ounces in a 5 gallon bucket half full with water. Use a flagged truck wash brush to apply. Then rinse with water. Then, observe your sparkling clean result!