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On a COLD engine I liberally spray Simple Green, and let it sit for about 1/2 hour. During this time I use a combination of a sponge and a brush to hit really heavy spots, I then carefully rinse the bay and motor. I blow it dry with a leaf blower, then follow up with about 1/2 can of tire foam.
I spray it down with orange blast that i get from Wal-Mart, let it it sit for about 5-10 min then rince it off with my electric pressure washer. After i rince it i start the truck and blow it off with my leaf blower, then follow up with the tire shine.