Sounds like a lame fix and it's only short term, but a little Adams In and Out spray makes it look great. I found out by accident while treating the black rubber and trim.
330i ~ BMW Perf. Susp. ~ M3 Front susp ~ BMW Perf Exhaust ~ 3.38 lsd ~ SF71 Alf CSL reps ~ Continental Extreme DWs ~ Looking for e93 M3 fsb and e90 M3 rsb