I realize that this is an older post, and you may have figured it out by now, but no one really offered graphical representation. I'm sure there are still newbs that might need it, so...
Here's the marked location of the alternator and the ignition. These are the two areas you should be most careful with when cleaning your engine. That being said, I only cover the alternators in my engines, as I'm not pressure washing them. The ignition/wires are sealed with grease to keep moisture out, and as long as you're not blasting water straight at them for extended periods of time, you shouldn't have a problem.
