Because of the crackle finish of the manifold using a cloth just moves the dirt around rather then lifting it off.
you could use water or a soap solution in a hand held spray bottle just to blast off the gunk/autoglym/dirt.
i've used a pressure washer on all 4 of my scoobs and never had a problem. just becuase its a pressure washer doesn't mean you have to get the nozzle right close to what your cleaning. You can wave it around at about 6-10 inches to blow away the dirt lifted by the gunk. just cover the battery with a carrier bag and don't spray direct onto any major connectors.
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