To me it’s just like plastic headlight lenses… if they’re bad or discolored enough to require aggressive compounds or sanding, you’re going to have to clear them to not only make them look perfect, but to keep them looking perfect in regular use.
I use the 3M Finesse-it Roloc sanding pads. I think they only come in the required small sizes in “stick-it” form so you can cut your own sticky back paper to attain whatever grit you require (if you don’t intend to pay them a fortune for their pre-cut offerings). I use the 3/4” ones the most. The foam backer makes a huge difference and you could do wet/dry or whatever. Usually just enough to get the raised up portions of the scratches flush and any rough areas that just look “dirty” to smooth and clean. The clear will take care of most of the rest and look new.
Aside from that I always thought there was a way you could compound/sand them flush to a perfectly smooth finish then quickly flame treat them to get the gloss back. Maybe that was something I just always wanted to try but never did. It works with other plastics 🤔
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