Ok,
You all suggest to do all of these things. But I know nothing about suspensions! What/where are upper and lower ball joints, sway bar bushings, ball joint on the upper control arm assembly (vinamgs idea), and sway bar busings? I only know where the shocks, springs, and brakes are.
Thanks for the help.

I'll try power washing it real thoroghly but I've washed the car, I'll try it again just to be sure.

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)