Smooth as Glass? Maybe not. Even new glass has some surface roughness - older windshields, damaged by road debris and acid rain are rougher still. See how clean your glass can be with this 3-step aerosol Diamondite System. Glass and Surface Cleaner (40060Z) reaches trapped debris that regular cleaners leave behind. Spray Clay (40058Z) is used with the (40059) Scrubbing Sponge to remove stains, embedded dirt, tar, resin and acid rain spots. Glass really shines when the Shield (40061Z) is applied. All products mentioned above are included in this kit.