Simple Green degreaser.

Put plastic bags over your intake, dizzy, alternator, battery, fuse box, and any other electrical components. Spray the entire engine bay and motor with the Simple Green. Let it sit for a couple of minutes and then hose it all off with a strong mist. Don't put the hose on "jet" or the water might force it's way into places it's not supposed to be. Works like a charm and a bottle of simple green is only a few bucks.