Small hand held upholstery steamer can clean off heavy grease. Spray bottle with Simple Green (Or other light detergent, don't dish soap-ever) mixed with water and softly rinse with a garden hose should move most dust. WD-40 I've heard will work, but I think it leaves some residue...not so good. I have used a Swiffer furniture hand held duster for some cleaning of bodywork. Could work in the engine bar for the gross areas, and then use the cleaner/water?
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