I found that the heavy detergents used in touch-less car washes would cause discoloration and an odd purple/rainbow effect on the Shadowline trim. Even though I don't use these car washes often, one instance and I would be forced to polish and wax the trim when I got home to get the marks off.
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2014 BMW X5 xDrive 35d M Sport Mineral White
2011 BMW 135i M Sport Space Grey
2007 Suzuki GSX-R 750
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