"Two products that I use for engine detailing are the CD-2 Engine Detailing Kit (You can do a search for that here. There are links.) and Advanage concentrate. I actually mix the Advanage with some degreaser concentrate from ValuGuard. That degreaser will clean up just about everything. I swear by that stuff now. The CD-2 is what I use to shine up the hoses and plastics under the hood. The majority of the work gets done by my brew though. I've got a couple great examples in my gallery if you want to go up there and check that out. I'm sure you've already seen em if you've been searching for engine detailing threads. I just have nothing but good things to say about those products."

http://www.advanage.com/

Before and after pics by the same guy.