A local window cleaner to me investigated this and tried jeweller's rouge. It didn't work.
I don't think there's any product that could help to be honest. When you think about it, it'd have to be something abrasive to grind the glass surrounding the scratches down to the same level; and that's going to scratch.
I hope I'm corrected, but I reckon the scratches are there to stay.
Are they bad?