I pressure wash or steam mine. Then use the air hose on it. No chemicals. I would not suggest doing it on a regular basis, nor on newer trucks. Water tends to do weird things if it gets to the electrical.
oh I cover things & do it with a spray bottle & toothbrushes etc. It was fun at the last meet no one had a clean engine like mine..............mostly, then again, no one had a cracked up front end either:3-startled:
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