Advanced non-acid, heavy duty formula designed by WeatherTech to remove damaging brake and rotor dust from wheels and rims. Thick heavy duty formula sprays on as a white foam/gel and sticks to the wheel or rim as it goes to work turning to a deep purple/red color as it cleans. This color indicates that the cleaner is binding to and safely removing the dust without harming the wheel finish. Come in 18 oz. Spray Bottle.