It`s not `drift` from the wheels, it`s been sprayed directly on.
I think its the cheap wash chemical they use and have said this to the sales guy. He of course said no way!
The only time I`ve seen these marks is because of caustic chemicals.
My car has had three `attempts` at having Supagard paint protector applied at the main BMW agent and during one of these visits it returned with the staining. At first the BMW guy blamed the Supagard wash chemical, but after myself speaking with the Supagard agent he said no way was it their stuff...so if its not BMW and its not Supagard who is it?
All I know is my shiney new BMW came back with stains, so BMW it is!