I want to change the fluid, and decided to look under the hood to locate the power steering reservoir because I don't remember ever seeing it. Sure enough, no where to be seen? HELP!

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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!)

When you stand in front of your car looking to the engine, you will see it at the right side of the engine, in line with the front of the engine. It is completely round of shape (round ca. 10cm), has a round lid and a black plastic mutter on top; you can't miss it.
On the picture below:

you will see some sides of the round lid under the bended water hose at the left side of the air intake hose.

good luck and greetingz,

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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)