Places to watch with self srv car wash sprayer? Need to get undercarriage clean

[r-mm]

After buying my 911 I had to drive over some muddy roads to get it home. The undercarriage is now nicely caked with dried mud - sorta thick in areas like the wheels wells. Before I do my first fluid change and valve adjustment I'd like to get it clean. Anything I should consider before taking it to a self service car wash and lightly blasting the wheel wells, etc?

Searched and found a bunch of threads on blasting a motor but not the car. The mess under my car isn't oil/grease, just plain old dirt so I don't plan on getting ballistic with the sprayer wand.

[wayner]

Spray out the area where the door post meets the rocker panel (lower front of rear wheel wells)

[RWebb]

this is a good way to get peeling undercoating off too

you might search up and post some photos of the undersides of cars at about the same MY as yours for further comments

if the F susp. pan is attached, I'd say you are safe all the way to the rear end of the rear seat area