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Have to agree with Tenac - re: have to dry w/ cloth several iterations of up/drown to clear all moisture. I think this is a broader BMW problem, not model specific. If you lower the window with moisture (either on the window or rain seepage into the window sleeves), they will leave a white streak. For me they are vertical lines. The best explanation I’ve received is that there was a change at some point to the sleeve material and they all will fail over time, so if you are paying on your own $ to fix it’s transitory at best. Garage Queens fare better than those left outside but I’m in SF so rain finds its way into everything.
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