The original High Performance formula is a pH controlled, non-acid, non-lye, water based detergent solution that will not damage expensive painted, clear coated, polished or anodized wheels. Highly effective against all types of dirt and brake dust. Spray on a dry, cool wheel, gently sponge to remove any drips or runs, allow to clean for a few minutes and then rinse all traces off with water. Extra dirty wheels may need gentle brushing prior to rinsing. Do not use any wheel cleaner in the direct sun or on a hot wheel. The kit contains a 16.9 oz / 500 ml bottle, spray head, sponge and an instruction booklet. The only wheel cleaner recommended by Germanys top sports and luxury car manufacturers. Our favorite wheel cleaner for normal accumulations of brake dust.