Regardless of how clean you think your wheels are, there are still contaminants stuck on the surface that eventually bore their way through the finish. Griot's Garage Wheel Clay leaves behind an ultra-clean, ultra-smooth surface that is ready to receive wax or sealant for protection. Clay is safe for all wheel finishes. To use, first thoroughly clean your wheels. Remove the clay from the wrapper and tear off a small ball. Next spray your wheel with Speed Shine® (it acts as a lubricant allowing the clay to glide over the surface) and rub the clay back and forth until there is no drag. Unlike other cleaners and polishes no buffing or hard circular motions are necessary. Wipe dry with our soft micro fiber cloth. Follow up with Detailer’s Pro Series Wheel Glaze to protect the finish and to make future cleaning much easier.. The large 7 ounce (200 gram) clay bar will clean many wheels depending upon the amount of contamination on the surface. The results are amazing!