Had it happen to me in the summer. It does come off with a proper wash. I don't know if it's the detergent per se but possibly the "wax" they say they put on because when I have put it through a touchless without wax option I didn't get the oily smears.
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2014 EBII 435i xDrive M-sport
Gone: 2011 TiAg F25 X3 xDrive35i M-sport
Gone: 2008 TiAg w/Coral Red E88 135i Cab M-sport
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