Yah.... i detailed my engine bay about a month ago when i bought my car.. go to an auto store and get a foaming degreaser... the heavy duty shit you might need 2 bottles.
then take tin foil and wrap EVERYTHING that even remotely looks like it could be electrical.
basic list of the stuff i did -
- fuse box
- ecu box ( i put plastic over that general area of the firewall. )
- everything under or below the fuse box i basically covered with tin foil.
those are the basics.. im drawing a blank right now.. i also did alot of wiring etc horn, headlight connections, etc
when the tin foil rapping is done spray the degreaser VERY generously all over EVERYTHING and i mean everything, your bay should look like a blizzard of white foam, then let it sit for 10-15 mins and let it eat away at the grit.
after that take a hose, just the hose with no pressure nozzle and gently let water run over everything in the bay until all the foam, grim, and grit is all washed away. let it dry, then wipe it down with WD40 to get a very black shine.. it will be looking like new after all this has been done.
i was really over cautious with the electrical shit when i did it but it worked really well and if i had taken it to be detailed they would have done the same thing except without as much care and consideration..