Engine Cleaner

I have had excellent results with Simple Green.

a. It's not harmful to the enviroment
b. easy to use
c. inexpensive

But, make sure you only use it on a cold engine, or it can dis-color some alloys

Simple Green Engine Cleaner in the (black?) pump sprayer works great (though it does leave a soapy residue), but be careful of getting it on your skin - it works well because it is a very strong base. I had it all over my hands while I used it for a few hours under my car, and by the time I went to bed my hands were peeling really bad. I lost a couple layers of skin and it took over two weeks for my hands to heal!

I would avoid any type of spray-on, hose off engine cleaner; even if you cover the alternator, distributor, etc., these cleaners always seem to cause problems and they are just sloppy. I have always used a soft cloth, the softest toothbrush available, and q-tips. It also helps 'for next time' if you wax the metal and painted surfaces after you clean. (don't use Carnauba-based wax though, it won't last past the first time you start the car due to the high temperatures).

Hope that helps a little,

--SONET

Check this review that Hack shared Hack's Engine Cleaner Review

Looks like the pics are no longer up but I'll attach one of his that I saved for reference (Thanks to Dan for sharing )

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