Fool Proof Headlight Restoration in 1 Kit – DIY Guide

The next step is to sand the lens. Start by using the coarsest grit sandpaper (1000 grit) to remove any heavy oxidation or yellowing on the lens. Then continue with the remaining sandpaper getting finer as you go (2000 then 3000), to smooth out any remaining imperfections. 

There's a few options for each grit of sandpaper. Some choose to do every step “wet” where they apply water or Clay Lube to the headlight and the surface of the sandpaper. Others choose to do the first two sandpaper grits dry and the final grit wet. The final (3000 grit) should always be done wet to help aid in removing fine marks and scratches from the previous sandpaper passes.