I used it (diluted, in nail polish remover form) to clean the cloudy yellow haze off my headlights. That was a major problem in 80s-90s Fords. It did the trick just fine and didn't hurt anything at all, but I've since found it's easier (and probably safer for the plastic) to use fine cut polishing compound or toothpaste and a coat of wax. That works wonders!
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