Buff/Polish Glass???

When i restore a vehicle i take out the glass and lay it flat upon a padded, folding frame then srape the rough stuff off with a razor. Then with water and soap lightly wash it with 0000 steel wool. After that process i wet it down and use a final glaze polish on my variable speed buffer and have had very good success with this process. Cheap try that's worth the effort. Having traveled through some of our desert areas, i do know what sand in a wind storm can do to a windshield. They maybe to deep for this process. Good luck and let us know if you come up with any great methods.
Small Block