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Simple Green is my choice. Built up areas can be cleaned first with a putty knife, then Gunk Engine cleaner before using the Simple Green. A long soft bristle brush works well to scrub with where you can get at it with something like that. I do the bottom side of the hood first and hose it off letting everything dry before doing the engine and fender wells. It usually helps to cover the distributor with a plastic bag before using water to rinse. I prefer normal pressure rather than the high pressure car wash wands because of possible damage to wiring harnesses and other more delicate items under the hood.

If you really want to be anal about it use your favorite wax on the underside of the hood and on the apron in front of the radiator. It adds addition charm and makes keeping it clean easier next time.

Randy