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Cerium Oxide (jewellers rouge) and some thing like this https://www.polishedbliss.co.uk/products/flexipads-rayon-glass-polishing-disc#aMaster_20FPRD0000 pad will polish the glass but he you can feel the scratch with your nail, the scratch won't disappear.
lynx-
Have literally never considered polishing glass. When I clean properly it gets clay dragged over the glass (pulls out all the junk that makes your wipers smear), glass cleaner/fine polish I guesss is what it is?, then sometimes use the finest grade of wire wool to finish off, then rain-x it.
And if the wiper blade fuzz gets too bad for winter low lying sun just put a new screen in it. Might have been able to save a few windscreens over the years if I knew polishing them would work! Have a 125mm RA and a 150mm DA.Dirty/damaged/smear/greasy windscreen is my biggest pet hate. Rest of your car can be a stinking pit of despair, but if you can't see out clearly = auto hate from me. Often justified as a cyclist number of SMIDSY's due to dirty/damaged/smear/greasy windscreen is insane and totally preventable.
BrickMan
On the subject of detailing, my old car's windscreen is showing it's age and a decent clean up and polish could really help. Any tips on product/s to use on glass?