There was a thread on this just a few days ago, and many in the past.
Usually it can be cleared up by wiping it with alcohol, denatured works well. If that does not quite clear it up, it can be polished with fine polishing compound, or plastic polish. Like headlight lenses, which there are many polishing kits for, it is a pretty easy fix.
some have put clear tape, or screen protector film on them after cleaning/polishing, but I found that when it starts to get cloudy again it only takes a couple minutes of polish to get it back to clear.
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