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I can tell you what Infiniti does. They rent out half the parking lot at my office complex. They have a field tent in the parking lot with drums of water. First they peel off the white plastic all over the car and plastic covers inside. Then they fill up small buckets and splash water on the car, clean and dry. Then have an electric buffer they use to polish the car. Finally scrub the tires and drive it to the dealership quite speedily.
I would imagine bmw does something similar.
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