Never spray a wheel cleaner on a hot wheel as it can cause a chemical reaction and permanently stain the wheel. Rinse first or depending upon the chemical. Severely dirty wheels with plastic center caps should be removed first to avoid possible damage. Start spraying wheel cleaner from the bottom up to avoid streak runs. Wheel faces should be cleaned with a wash mitt or a soft brush. After washing, wheels should be polished and waxed. Regular washing also helps in maintaining the cleanliness of wheels and mercedes brake dust shield.