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i never had an issue with Chevron touch-less washes and xpel and had all my cars covered in xpel.. if anything on the bmw gloss black trim (i.e. around windows etc) carwash soap would leave stains on it, probably super concentrated that it eats into clear almost.. but i've never seen it have any impact on xpel film.. that stuff is pretty bulletproof! I've opted since for self wash at home with pressure washer just to be safe..
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