I'm happy with Simple Green Max (pump sprayer). I warm the engine up slightly (warm to the touch) so that it will dry quickly, spray on the Simple Green, hose it off. Some buildup of goo will respond well to being scraped to thin it out or you'll need to clean several times.

I've used Gunk and many other aerosol / foaming de-greasers that are nasty chemicals in cleaning my many diesels from Caterpillar to Mercedes, and my experience is that the (boidegradable) Simple Green works as well as or better than any of the expensive toxic ones.

Rinsiing thoroughly is important, and drive the car later to ensure that it is hot and dry.

To do it right you should protect dipstick openings, wiring connections, etc. from any of the degreaser sprays.

Clean leaves etc. out of drain areas before starting.

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Gone to the dark side

- Jeff