If I just washed it before taking it in then yes, I get it back more dirty than when I handed over the keys, but if it hasnt been washed in awhile, then I comes back cleaner. Although not the type of "clean" I would prefer, but its still better than before usually.
Biggest problems are water spots or water that hasnt even yet dried, streaks on glass, and always atleast 1 spot that didnt get touched with the sponge so now it has a dirty mark... all of which are MAJOR pet peeves. But I might just have too high of standards for my truck. I usually wash it myself every 1-2 weeks, and each wash takes me minimum 3 hours from start to finish. More like 4-5 if I am in no hurry at all. But then again I detail the shit out of it! I literally take interior panels apart to get all the dirt in the cracks, sometimes unbolt the seats to vacuum underneath around the amps, do windows inside and out, armor all tires and detail rims, shine on all black plastic even mirror shrouds and antenna and flood lights... its excessive and not noticable to the average person, but I can tell. My washes make it look like day 1 off the lot
Ill even clean the wheel wells and shine suspension, clean undercarage usually, and the roof as well.
Call me crazy but its ok. So going back to the question.... dealer doesnt touch my truck if i washed it within the past couple days.
BUT, on the other hand, I do a bunch of
right before dealer trips just to make the wash worth it
Gotta love watching the dealer put in work for free. And they still usually do an exceptional job with it