Is it possible to remove sand blaster marks off windows? Can glass be repolished? I accidently sand blasted through the door handle holes and onto the glass.

I'm afraid you may be outta luck on those windows. The stuff to use is called cerium oxide and a stiff pad on a grinder specialy made for buffing glass. You will have to buff each spot for about 30 minutes. If it does come out you will be able to see some distortion in the glass right there. I don't know where to get it anymore but a glass shop may be able to help you. It just removes fine scratches that you can't catch your finger nail on so........you may be to deep already.
Good luck,
Roger