I just got my 545i back from Jeff Gray after they've sorted something out and been very helpful - only to find all four of my alloys have peeling on them. What has happened is that my alloys have been repaired (2 by Wheel Magician for me and the other 2 by previous owner) which involved fixing kerbing and then repainting.
Jeff Gray being the thorough guys they are cleaned my car including allow wheel cleaner and *water blasting* which blasted the paint off They're sorting it out and perhaps they'll back off from water blasting - or just turn the pressure down a bunch in future.
So the learning is that if you take a car with repaired alloys to a dealer - make sure they don't water blast the wheels!