I use Auto Magic Engine Wash, there is no need to protect anything in the engine bay, those engines can take a good soaking and have no problems. Trick is to do it when the engine is cold, spray the stuff all over the place, use a sponge to loosen things up a bit if needed, then use a pressure washer with like 1100-1400 psi or so. Wash everything and when its good and clean start the car up right away and let the car run and the engine will dry itself off. If you have compressed air you can blow it off while its running as well.



Then spray your favorite silicone spray all over the place to protect

everything.



The auto magic stuff wont harm glass or paint or any metal under the hood. I have literally cleaned thousands of engines in my time using this method.