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I believe both Rich and Jamie (maybe others from here) have used their PC to get fine scratches from the glass, I think it was AG Glass Polish that was used by Jamie.
I use the PC to deep clean glass, won't sort out scratches though. Glass polishers use Jewellers Rouge, and front.co.uk sell a kit that goes on a drill, in most cases deforms the glass removing the defect and new bit of glass is the only real option.