Try researching different brake pads. There are some that don't leave that much brake dust vs. the OEM pads that come with the car. On my previous 325 I did that and it made a huge difference. 5 days of driving was like one day from OEM pads.
Ironically I'm so clean with my cars that I washed my wheels every time I washed my car anyway. Even when it wasn't that dirty.
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