If you can get a fingernail to catch, you may not be able to do much.
I had some light marring in my quarter windows that came from dirty, contaminated cloth pads that rest against the glass and act as guides. I used a kit from local auto parts store that consisted of some adhesive disks you use with a drill and water spray to grind out the blemishes. It worked fairly well and removed 95% of the blemishes. Unfortunately I do have the name / manufacturer on hand as I write this. These days there appears to be quite a few products out there that may work in a similar manner.
Most important thing you need to do is find the source of what is causing the scratching / blemishing of the glass and correct it. In my case I replaced the old cloth material with new felt material.
I also once had an issue with a weatherstrip staple that was not bent in far enough which put a deep, deep scratch into a brand new quarter window the first time I rolled up up. I recall throwing a cover over the car in disgust and walking away for a week or so after it happened.