get yourself two cans of Gunk Foamy engine brite.
When you pull up and get in line, pop the hood.
Sray both full cans all over the engine bay. Hold your breath!
Get all the metal sides of the engine, around the pullies up front, sides of the radiator, the friewall, around the brake booster, etc.
You really are not going to hurt anything in a stock engine bay with water.
Let it sit for a couple minutes (or until its your turn) rinse with low pressure thuroughly.
rinse rinse lots, you can use high pressure in some spots but there is no need, low pressure will rinse it off.
the only two things to really worry about is getting too much water in or around the airbox, a little puddle will form on your powersteering cap which is vented so use a rag and soak that water up, or once its close to dry, remove the cap and empty the water.
They dont build them like they used too...with all that plastic and no carb you can get en engine pretty wet these days with no ill effects.
As stated above you dont want to soak the alternator, but hitting it with water will not hurt it, avoid direct spraying the brake resevoir, oil or trans dipsticks, airbox, and battery. You can wipe the standing water off the coil pack, battery, etc before you start it up.
You can also leave it running during this whole process, but I never have.
Here is my 96 I picked up from my brother, who after owning it for 8 years never once cleaned under here, he might have added washer fluid now and then but any other hood lifting was done by paid people and they dont clean.

Here it is after about 12 hours in my possession and 2 cans of engine brite: