Plexiglas scratch remover
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Gary Ward
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I used this stuff and it worked great. It was really surprising how well it worked.
Rcmutz
Pattern Altitude
Be careful, it does say for Professional Use Only. Of course if you are a professional, then you are ok to use! 
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I've had good success with the Novus products, which are available on Amazon (and are fairly inexpensive). There are medium, fine, and cleaner grades that you work through sequentially. The final one is also a great windshield cleaner.
Gary Ward
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I get the sarcasm...Be careful, it does say for Professional Use Only. Of course if you are a professional, then you are ok to use!
Don't let that shy you a away from that kit. It will make you an expert after you use it. So easy to use and impossible to screw up your windscreen when used properly.
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3M has/had a system that did rather well with no distortion which I used with good success.
Ed Haywood
Final Approach
I found the same methods used on auto clear coat paint work. Coarse and fine compound, finishing with plastic polish. If scratch is deep, may have to resort to sandpaper coarse enough to match scratch, then successfully finer to 2000 grit before compound. Harbor Freight or Amazon has various foam balls and cloth buffing pads that fit in a cordless drill. Test your methods and materials on a scrap.