D72 Purple+ Wheel Cleaner is a highly effective acid-free, non-caustic, pH balanced, cleaner for all types of wheels: steel, alloy, chrome, painted powder coated, uncoated and anodized aluminum. Effortlessly loosens and removes stubborn grime, such as burnt-on brake dust, oil, grease, rubber residue and other road dirt from wheels, rims, hub caps and lug nuts. Turns bright red while fighting grime. Directions: Ready to use. Spray evenly on cool, dry wheels. Let stand 3-5 minutes. Liquid will turn bright red as it contacts and dissolves brake dust and soils. Use a wash mitt or brush to loosen stubborn grime. Rinse thoroughly with high pressure.