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Celtoid,
I went to Aldi and bought the cheapest whitening toothpaste I could find. This type has a mild abrasive (actually I think all toothpaste has some abrasive element but this has a little more) then used my cheap $20 chinese electric buffer.
I used the whole tube.
As mentioned it will clean up the fine scratches but takes some perseverance. If nothing else your window will smell nice.:p
I believe the professionals will charge between $100 and $200 for a better job, then of course you might drop the gas bottle whilst unloading the roof rack and.........insurance claim;):wasntme:
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Have you tried plain car cut and polish? We use it to remove scratches from caravan windows (which are perspex) but I also have used it to remove nasty water marks from a car window (that I was told when I bought it that they could never get them off) and it worked a treat.. :)