i have polished alot of plastic. what i use is a product called novus. it comes in 3 stages. novus 3 for deep scratches, then you move to novus 2 for medium and then finish off with novus 1. i have a bunch of pinball machines and used it to polish the plastics on them.
mine still has some scratches, but overall came out pretty good.
it is like rubbing compound for cars only for plastic.
tom
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