Recommend using the products instructions for polycarbonate. BTW, how did you get chips in the polycarbonate covers? I have 4 years on mine with no significant marks at all. Rocks just bounce off without a mark.
for minor scratches polishers would probably help, if it's actually chipped significantly (if it's big enough for you to see a pit) it isn't as likely.
I had a pit on my headlight, pretty small (like the tip of a pencil)... cleaned the lens cover well and put on lamin-x film.... after the film cured, you can't tell there was a pit there and now my lights have a bit more protection.
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