Full sympathy, i have just collected the g/f Leon from Seat having had 4 wheel laser done. 'Sorry Sir, we have had to replace the front number plate, as we broke it washing your car!' Some wash the wheels are filthy and they have missed half the car!
It is always better to have a dirty car than give it a quick wash yourself or worse allow the 5min swirlamatics loose on your pride and joy.
Ive seen them plenty of times drop the wash mitt or shammy and put it straight back onto the car!