The factory does not apply any wax. Neither does the VPC.
During transport on the rail from the factory to Bremerhaven, the cars can get some rail dust, particularly on the rear bumper area. However this is less than it used to be since BMW now uses enclosed rail cars. In addition the cars pick up debris from their travel on the ship. The VPC does wash the car but they don't clay it - so the embedded debris is still there. The amount of debris varies a lot from car to car - but it you use a light colored clay you can see what it picks up.
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