I live in the country roads and there's lots of dust flying around a lot of the time. Got a 2004 3.9 automatic that looks like its 99 cuz its so dirty. I don't know how to clean it. I tried some engine degreaser although it doesn't have grease just dirt and didn't work. I don't need some powerful formula I need some high pressure spray can that'll knock the dirt off. I've thought of spraying it w/ high pressure water at those do it yourself car washes but I'm afraid of ruining my engine. I don't know if I can do this cuz of the electrical thinngs in it. My friends tell me I only need to cover two things w/ plactic bags, near the spark plug wires and some other big piece. Any suggestions. Intake manifold is a pain, its rough texture won't allow you to scrub it...high pressure is manditory i think.