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Never ever ever use a pressure washer on the underside of a car if you are in a damp / wet climate. You will manage to push water into more places where it shouldn't be.
I don't have a quick solution for cleaning the crud off of the underside - I use engine de-greaser and careful scrubbing with a brush. The best way of removing the stupid rubber Mercedes factory fitted undercoating is to use a powerfull hot air gun / blow torch with a rigid paint scraper (the type you'd normally use on window frames).
If the metal is rusted underneath you can easily remove the undercoating with your fingers - if you were to use a pressure washer you'd blast straight through it; possibly past the rust or through it pushing water into places where you can't dry it out. If water gets between the spot welded joints on these monocoque constructions you may as well kiss your car good bye.
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