I was told that to remove scratches etc is not that easy. Heavy-duty buffing and polishing required. So I sprang for the mortgage payment and replaced the windshield when I repainted the car. Reproduction windshields are not that expensive (mine cost $230, tinted glass, no green bar. Clear glass for some reason is around $360), and I had it installed by a professional (recommended) for $50.
Cees Klumper in Amsterdam
'69 white 280 SL automatic