Cars and Parts had an article on polishing marks out of windshields, some time ago. Of course they would be safety glass. There was a whole kit mentioned. It even said that if you take it too far, you can actually create distortions.

1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed

My Chevy Master 4 Door is on the Road!