I suspect any plastic trim and/or bumper will begin to lose its luster after a few years of exposure to UV rays. This is why I try to use a reflector inside the windshield to help preserve the dash plastic. Although in that case it is more a heat issue than a UV issue since UV will not pass through glass. Getting back to the outside plastic trim, I apply a protectant every month in the summer. I wish they still sold the stuff used to shine up the old black vinyl tops on cars. That stuff reminded me of shoe polish, and did a great job restoring those black vinyl tops.
2006 XC70 Ruby Red, mfg 03/06 (traded)
2005 S80 Ash Gold, mfg 11/04
2016 XC60 T6 mfg 04/15
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