I use Meg's PlastX. Only go over small actions at a time. I use enough to keep it clear for 3 minutes of polish, then wipe clean and repeat until I get the results I want.
If I can still see fine scratches, in bright sunlight for example, I use Meg's Plastic Cleaner #17 & Clear Plastic Polish #10. But this really takes a lot of time and patience.
I have best results if I can remove the trim to open up the entire cluster.
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