The gto I built had a few bad scratches in the windshield, caught a finger nail as well. Very fine sandpaper followed by Mcguire scratch x and finally novus polish. I had found a replacement online so I wasn't afraid of a mistake. I look at some mistakes, and the cost of making them as the cost of that education. I did everything by hand. No power tools. I actually tried the scratch x before sanding. That way i didn't go too far right from the start. Might be worth a shot.