Regardless of how clean you think your paint is, there are still contaminants stuck on the paint that you need to remove before waxing or polishing your paint. Paint Cleaning Clay leaves behind an ultra-smooth surface that will make your wax adhere better and last longer, too. It also makes the wax much easier to buff out, reducing your "elbow grease" substantially. Clay is safe for all paint and also works great on glass to get it squeaky clean. To use, just remove the clay from the wrapper, spray the paint's surface with Speed Shine® (acts as a lubricating fluid), and slide the clay bar across the paint. No need to rub hard. When there is no drag your paint is clean! Wipe dry and your finish is like a baby's butt without the streaks. Unlike other cleaners and polishes, no buffing or hard circular motions are necessary. Follow up with any of our paint sealants or waxes. The large 8 ounce (226 gram) bar cleans about 7 vehicles, depending on the amount of contamination your surface is covered with. The results are amazing!