My radio has no audio (sound)

What is your question?

Was working great. Took it into a car wash and the sound cut out and didn't come back on. The radio is on, but no sound can be heard. Do you think something got wet or came loose. Everything else works, just no sound.

What makes this problem better or worse?

There is just no sound coming out of the speakers or anywhere

How long has your 2002 Mercedes-Benz C320 had this problem?

4 hours