We have a '21 wolf grey Nightfall edition that showed no effect until our dealer washed the car during an oil change/multi-point inspection. It tarnished terribly with the wash job, when it had not seemed to do so with our many washes prior to this one. We brought this up with the dealer, who then tried to buff out the issue. That created two problems: chromed spots rather than tarnished spots, and us not wanting to return to our nearest dealer (who sold us the car). Our next closest dealer, 100mi away, turned in photos of the issue and has guaranteed us full replacement of the trim. This has been a few months now, of waiting on the trim to arrive, but at the very least it gives us hope that Kia is going to cover the replacement of the trim. Different dealer, different results, I'd say. I'm anxious that pulling the rear panel small windows to replace trim there might result in new noises, as we currently (<60Kmi) have very little road noise. I'm anxious that the deal will fall through and this dealer won't be able to cure it at no cost. I'm anxious that we've been advised that the new trim is exactly the same as the old trim and can also tarnish. I'm anxious that we'll get past 60Kmi and Kia will forget the guarantee they made us a few months ago. But, we do have the dealer and Kia's guarantee of trim replacement at no cost, for what it is worth. Good luck on your end