Heres mine, this was in my old firebird. Took it to work, sprayed some of our degreaser on it, sprayed it off with a powerwasher, sprayed our engine shine and just let it sit. Not to bad...   
Before... 
http://img.photobucket.com/albums/v54/Jags4life/Jag/Car/new_wires.jpg   
After... 
http://img.photobucket.com/albums/v54/Jags4life/Jag/Car/cleanengine.jpg