the crud plastic lenses on my old chrysl minivan yellowed badly. When plastic is exposed to the elements, the top layer dries out, reducing it's trasparency. A good plastic polish, like meguiar's plastiX will clear off the yellowing by using a mild abrasive to buff off that outer layer. They also have a chemical treatment in them that helps keep them from drying out again so quickly. I could not believe the results. A few seconds of rubbing, and my 11 year old yellow lenses were crystal clear again.
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