Late last fall I noticed that all the dark grey plastic that runs along the bottom of my MKC has white swirl marks. I have used Turtle Wax ICE in the past, and they recommend that you use it on all surfaces, including plastic - which I did. The first couple of times I waxed, it looked great. Now, I am stuck with these white swirls. Any idea on how to remove this? It was a "date night" car, so the dealer could have done something to it before me. I have tried some Turtle Wax plastic trim restorer, and that seemed to work, but not sure for how long. Any ideas on what to do?