haasman,
fix for bushings was not cheap, $500, yikes!!! mostly labor.
-mike

Squeaks...
 

Hi there,
Your comment that the noise disappears with a car wash makes me suspect a squeak at the rear window glass between the rubber molding and the glass. Try dowsing the molding to glass joint with some silicone spray, and if it makes the noise go away, have the molding replaced.
Richard Wooldridge
'82 300D/4.3L V6
Etc...

Thanks, Richard, I have that in mind also, hmmm....