Don't presure wash it. Get some good engine degreaser and a small brush for corners.
Use a trickle of water so you can control what's getting wet and what's not.
Cover your bare wires at the injectors, the alternator, coil if you've got one (wouldn't worry about the Coil on plug), and anywhere you see the wires going down into a plug. (Water in a wiring harness is bad news.)
I generally use a plastic grocery bag, cut it into strips, and wrap those around or over the delicate parts. Then hose it all down w/ Gunk Foaming Engine cleaner. Then rinse, and repeat w/agitation where necessary.
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