Polishing glass

It depends on what type of marks they are, if they are scratches from missing felts, they may not come out.....& anything that can remove scratches can leave a mess of fine swirls that look as bad or worse.
The Pre-owned Toyota sales manager I've known since the mid '80's when He was a young-buck, said they had a couple of services attempt to polish out scratches in an expensive to replace piece of glass, and made a mess trying. So, Jeff said no more of that, if scratches are a deal breaker...the replacement comes out of the appraisal value right there.
I have a rear side-glass for a '63-'64 Impala Cpe that is in decent shape, but has some odd surface staining, I worked for multiple hours using compounds & fluids & only diminished it by ~1/2. Just My experience.