Are you talking about the factory roof rails or an added aftermarket roof rack? I've never heard of any issue going through a car wash with factory rails. What about finding a touch less wash, if it worries you?
I personally clean my car myself, but the odd once or twice a year I'll run through a touchless with my added rack and my bike attachment on, with no issue.
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2012 F25 X3 xDrive35i M Sport
Titanium Silver/Chestnut Nevada
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