I recently took my 2006 C220 Coupe into a Soapy Joe's Car wash and they managed to spray water on the inside of the rear tailgate. The consequence was that the RF central locking and the car radio no longer operate. I took the car to Mercedes and they said the Rear Screen Amplifier was damaged, the sting in the tale is that it would cost approaching £1000 to have them repair it. The part new itself is expensive and the tailgate window has to come out and replaced. Apparently this is a common occurrence in the USA when shading is in expertly sprayed on the inside of the back screen? Help please! there must be an better solution.