[spdbrake]

You may try Plexus or Lemon Pledge polish. (What we've used for decades on Helicopter and light aircraft windshields.)
Both fill the myriad of fine scratches in Plexiglas and Lexan.

[ame]https://www.amazon.com/Plexus-91-20214-01-Spray-Cleaner-oz/dp/B002MQCYO0[/ame]

Or to permanently get rid of the scratches use Novus polish.
[ame]https://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Dautomotive&field-keywords=novus[/ame]