Amateur here with some problems on paint + glass.

[Arro]

Did you try ammonia? I had tint in which the previous owner had tried / started removing and then quit after they had removed the clear reinforcing layer, leaving behind the tint and adhesive. It took some elbow grease and some time letting the ammonia soak in before carefully taking a sharp razor blade to it for complete removal. Now you can't tell there was ever anything there!

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[androdz]

Tried nail polish remover and nada

[wcharland11]

I would try Rapid Remover. It's a spray designed to remove vehicle wrap adhesive. Spray on leave on for 1min wipe off. It's worked well for me with old dried on adhesive.

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[wcharland11]

Once film is removed polish scratches out with DA using medium and fine polishes. I hope it works for you.

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[Red Hawk]

Depending on how bad the scratches are, you may be able to machine polish them out. Griot's has glass polishing pads which are carried by AG as well as dedicated glass polish. Glass is tricky because you don't want it scratched where it impedes your vision. You may have to go with a heavier cut compound. Good luck.