While retooling the scent, we've infused Heavy-Duty Wheel Cleaner with more active ingredients so it works harder to remove stubborn road grime. The new formula will turn a deeper purple to signal that it's working. Heavy-Duty Wheel Cleaner is a pH-balanced, non-acidic, and non-caustic formula that's blended so it clings to the surface to promote deep cleaning. Spray Heavy-Duty Wheel Cleaner on, allow it to remain on the wheel for 3 to 5 minutes, gently agitate with any one of our cleaning tools, and then rinse clean. Safe for use on any wheel finish: painted, chromed, uncoated aluminum, powder coated, and anodized.