A dip in bleach clears plastic good. I wiped the my headlights with bleach, to make sure it doesn't get damaged, and it helped a little so I'm pretty sure if I left it soaking in some bleach it would do the job, well...with a good waxing after as well. Not 100% bleach neither maybe like 70/30 more water. Only reason I haven't tried this theory is cuz I'm too lazy to pull of the plastic from headlight assembly. All I know is it didn't get damaged after rubbing the hell out of the headlights so proceed at your own risk.
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-Juan
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