I’ve washed my engines for decades and only had a slight issue once with an old one where a quick dry of the distributor cap solved things. Just don’t blast hot exhaust manifolds or a turbo to avoid cracking those. A clean engine is one where you can spot things like an oil leak more easily and pinpoint the issue. Just be cautious with where you spray and all is well. Modern electrical connections are all gasketed and watertight.
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"The trouble with people idiot-proofing things, is the resulting evolution of the idiot." Me
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