I replaced these turn signal lenses shortly after I bought the car. The lens covers quickly went milky in the sun and the rubber seals perished in no time.
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The areas of the lenses are covered by the fake plastic chrome cover still look immaculate.
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The Sprayway glass cleaner did a great job of cleaning them up, but the exposed areas were still rough and sun baked.
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I questioned whether or not to just put the old assemblies back in. The lenses are clear and still fully amber, but are crazed and cracked all over, which is why I replaced them in the first place.
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I have used this Kit Scratch Out in the past to clean up foggy plastic headlight covers.
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It did polish the roughness away, they are now slick and shiny, but still cloudy.
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Did I mention the rubber seals are perished? Either way, the lenses look 40% better than they did a few minutes ago.