I never have, probalby never will as long as I can keep from it.
I think we are getting mixed comments from RP. This is an old post...
First and foremost, you need to know that the engine compartment can be a very tricky area to detail. Everything YOU do YOU do at your OWN RISK... Now that the disclaimer is out of the way... on with a suggestion...
And I'm quoting from Meguiar's Application Bulletin for the Engine Compartment dated 3/04...
1. Park vehicle in shade and ensure engine is warm to the touch.
2. Mix wash solution
3. Open hood and cover key electrical components with plastic (distributor, wires, etc).
4. Spray entire engine compartment with water using pressure washer or hose with nozzle to remove loose contaminants. Again, be cautious around electrical components.
5. Wet adjacent body panels with water.
6. Using wash mitt and wash solution, lather all adjacent panels. DO NOT RINSE!
7. Spray entire engine compartment with Meguiar's Super Degreaser (4:1 dilution). (I might mention that Safe D-greaser is a safer product and is a bit easier to use... I would substitute Meguiar's Safe D-greaser or Simple Green).
8. Agitate any stubborn areas with a brush.
9. Rinse engine using pressure washer or hose nozzle.
10. Remove all plastic from key electrical components.
11. Apply Hyper Dressing (4:1 dilution) to entire engine compartment. (any dressing will work... I prefer Meguiar's #40 under the hood).
12. Close hood.
13. Rewash adjacent body panels with wash solution and rinse with water as needed.
I think that should do it. That is, generally, the technique that I follow when I do an engine. It's not rocket science by any means but, you can cause VERY serious damage if you don't pay EXTRA SPECIAL attention to electrical and other sensitive items beneath the hood.
Notice right above this line it says, "That is, generally, the technique that I follow when I do an engine."
HAHAHA. J/K RP, listen to what he has to say 5.4 crew...