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FWIW I owned an 2004 E46 convertible from 2012 to 2020 and used to go through the car wash all the time. Then one day the water came in between the window seal and the top itself - not fun, luckily I had a small towel in the car but I got soaked. For the next two years I just didn't wash it until I got ready to sell it this June. I had retired in 2017 so no more commute. Then I used BMW top cleaner and BMW top conditioner, the top looked fine. My 2021 M240 will NEVER see a car wash.
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