Wash your vehicle in the shade with Undrdog Soap to remove any dirt build up, while the vehicle is still wet, spray The Purps on paint and wheels. You will notice in about 2-5 minutes the paint will begin to turn purple where there is iron contaminants imbedded in the paint. Rinse well and wash away the embedded contaminants.
** Note - do not allow product to dry on any surface of your vehicle. Use in a well ventilated area.