2008 Sprinter Van had not been waxed in 9 years. I had side windows added to the van and the installers did not clean the cut-powdered-metal-flakes when finished. Two weeks later, surface rust that could not be washed off, covered the van. One Surface Prep Pad (medium) with soapy water removed the rust 99%. Waxed the van with Nu-Finish. It has been a week since cleaning and waxing my Sprinter and my upper body, neck, and shoulder blades have almost recovered.