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I remember the first time I washed my jet black (non metallic) 2002 540i and I left marks in the paint from the cotton towels. Ouch!! I quickly researched and bought microfiber towels. I have an IB M3 and do not have any swirl marks after 6 months. I am not a paint expert, but I it seems the metallic paint helps hide the imperfections that are easy to see on non-metallic paint.
I have improved my car washing over time...microfiber mitt and drying towels, wash as the wind would flow (no circular motion), wash from top to bottom of car, rinse the mitt often, and wash the mitt/towels after each use. I also use separate towels for the main body, inside door jambs and wheel wells. Following these easy steps will help keep your car looking good.
BTW...I have not found IB hard to keep clean. Keep in mind I have owned jet black cars for 10 years, so anything is easier than black.
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