P21S Wheel Cleaner is approved by and supplied by leading automakers and was the 1st wheel cleaner to safely clean and inhibit the build-up of brake dust and road dirt on all types of wheel finishes. Spray on, hose off, without having to use heavy elbow grease or worry about surface damage. P21S comes in two formulas-the Original Liquid and the Gel. The original formula is perfect for regular maintenance and light soils. The Gel Wheel Cleaner has formulated especially for heavily soiled wheels by clinging to the wheel's surface for incredible cleaning performance.