Optimum FerreX™ is designed to dissolve and remove ferrous oxides from wheels and painted surfaces quickly by bonding and dissolving them away with minimal effort. Furthermore, Optimum FerreX™ will dissolve and remove other surface contaminants such as tar and wax at the same time. Directions for wheels: Avoid using on hot surfaces. Wash wheels to remove excess contaminants. Spray Optimum FerreX™ directly on wheels and allow 1 - 2 minutes to fully dissolve ferrous oxides. Agitate with a soft bristle brush as needed. Rinse off with plenty of water. Directions for painted surfaces: Wash with Optimum No Rinse™ Wash & Shine or Optimum Car Wash before applying Optimum FerreX™. Use on a cool surface and out of direct sunlight. Spray Optimum FerreX™ directly on painted surface and allow 1 - 2 minutes to fully dissolve ferrous oxide. Agitate with a microfiber towel or soft sponge if necessary. Rinse off with plenty of water.