What should I use to clear up foggy head lights?

They are typical plastic head lights on a Honda Accord.What should I use to clear up foggy head lights?
Ive heard taking emery/wet sand paper to it.Use a finer grit.They also have aftermarket repair products you can purchase.What should I use to clear up foggy head lights?
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how to clean foggy head lights





truth is but new one but you can get by with cleaning them sometimes