Acid-free, pH balanced formula is safe on all wheels and won't damage wheels. Safe on various wheel finishes including: Chrome, Aluminum, Steel, Clear Coated, PVD, Painted, Plastic Wheel Covers, Magnesium, AND Aftermarket Wheels. Watch the color changing activate when it comes in contact with the ferrous metals (iron) from brake dust or other dirt and grime. Full Effect sprays on fluorescent yellow, then turns deep red or purple as it dissolves brake dust. The advanced and effective chemistry in Full Effect wheel cleaner attaches and emulsifies stubborn baked on brake dust. Simply spray on, let it dwell, watch for color change, agitate if necessary, and rinse with water. For best results rinse using high pressure water. Full Effect is great for both the DIY (do-it-yourself) and the professional. Effortlessly achieve shining wheels that will make your vehicle look like it just rolled off the showroom floor. Full Effect needs to be used on cool and dry wheels. Product is ready to use, do not dilute with water. *Use caution when applying this product to anodized wheels and brake systems - test in an inconspicuous area prior to use. Use Sonax Wheel Cleaner to safely clean dirt and brake dust on hard to reach wheel barrels and calipers, too.