I just got an '01 S60, Ruby Red. It has two strips that run the length of the windshield/roof /rear window, just above the doors. The strip has turned a blotchy gray. It appears to be oxidation, as I can scrape it off, to some extent, with a knife edge or steel wool. Is this common, and is there a best way to restore the finish, or is repainting the best bet (though I have doubts they ever were painted; more likely the color is in the material). Thanks, Paul