Wet sand the whole canopy with 600 grit, then clean it and spray it with a light coat of clear ( I use PPG 2021) wet sand again with 1500, then 2000, and 2500. Polish it out with rubbing compounds.

Alternately Micro Mark sells a set of polishing sandpaper that goes up to 12000 grit it works very well, the above method has just been easier for me in the past.

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