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Something GTechniq C1, 4 or 5 are uv resistant with some mild scratch resistance.
I never used anything other than a durable wax on mine for 7 years and they still looked as new. I'm sure a lot of it comes down to what they are washed with
A decent wax, or as Dave has suggested, C4/5/the old 1. They are plastic so these products will protect them for about two years. My head and tail lights still bead 18months after application.