Get any metal really hot (i.e. Exhaust manifold, block, etc.) and then drench it with cold water, and you run the risk of cracking. Just don't drive 90mph for 30 mins straight to get to the car wash, and immediately spray the engine, and you should be fine. Like I said, you can turn the engine off, just cover all the vital stuff (intake, electronics, reservoirs) with plastic bags, and go to it. Elbow grease will still be your best friend.
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