Maybe the best option is to install an aftermarket felt on the edge of the aperture where the window goes in so it is easy to wipe/vacuum clean to ensure it is dirt free.
Best thing to minimise risk of dirt is wipe the top edge of the windows periodically.
Good to know that no f30 owners have had issues so far
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2018 BMW X3 xDrive30i M Sport
[sold]2013 BMW X3 xDrive30d
[Sold] 2013 F30 328i
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