I lightly spray the engine bay with water after I put plastic bags over at least the alternator. Wrap any connectors that you can see with some plastic too. The more time you spend covering stuff up the more sucessfull you will be. Just like masking before painting.
After rinsing the bay with water I spray a fairly fine mist of simple green cleaner on the engine bay and let it sit for a minute or two. It's pretty tough stuff so you really need the water to dillute it. Don't let it sit too long. Use a brush with long plastic bristles that isn't too harsh but will still scrub some dirt off. After scrubbing rinse the engine bay off and let dry. Remove the plastic you put in after it dries and little and let it full dry before running it. If anything got wet it's best to let it dry out before turning anything on. This has worked pretty good for me.
Also, another product that is great is CD2 engine cleaner. Follow those instructions and it works great.
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