I hate most dealer courtesy washes. Most of them just spray the cars down with water, dry with a rag, and spray some tire dressing on the tires <em class='bbc'>and[/i] wheels.
However, my BMW dealer actually is pretty good. They know what a swirl mark is, and know how to use a D.A. PC to correc them. They also sell and occasionally use repackaged P21S and Meguiar's stuff, BMW Gummi-Pfledge, and also Klasse.
:up