Shake bottle before using. Spray Star brite Instant Black Streak Remover directly on stained area. Let application soak in for 30 seconds before using a clean cloth, brush or sponge to wipe away stain. Rinse well with water. Severely stained surfaces may require a second treatment and light scrubbing. Will not remove wax or polish; safe for fiberglass, vinyl, plastic, stainless, rubber and painted surfaces.