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Had a guy at the local Porsche dealership tell me that WD-40's good for restoring the plastic cowling material at the bottom of the windshield (ie the area from which the wipers sprout). He said spray it on, leave it for awhile, then wipe it off with a WD-40 moistened rag. I believe he also said you could do the same on the black base of the sideview mirrors that attach them to the car.
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