I have asked about this same issue on another site as well.......I have 2004.5 C230K Sedan. The black b-pillars on my car have ugly swirl marks in the sun. Some suggest to use a swirl reducer, but I am under the impression that this for paint. Others have said to use Mother's "Back-to-Black," however, that is for plastic or rubber. Can someone please tell me what the b-pillars are finished with and how to get the swirls out.