Paintless Dent Repair (PDR) can be used to remove door dings. This is relatively new technology that really works. I am glad my E46 has side mouldings, but they are no match for the doors of a high-sitting SUV that decides to park next to me. I always try to park far away from all other vehicles.

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Alpinweiß
E46, E83, E90 (all with three pedals)
BMW CCA member