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As with London Hackney Carriages which needed to be steam cleaned before testing, which might be a better option than a high pressure wash.All HGV S have to be cleaned prior to the Annual Test.
Having operated these vehicles for over 30 years we have never had a problem. I will use a jet wash on my own cars and once a year I will give the MH a quick wash off. I do not flood the engine bays but for the HGV s all oil and contaminants have to be removed from the vehicle, top to bottom prior to test.
I bet your car didn't have Fiat electrics.I worked for a company building jet wash pumps and regularly jet washed the engine of my car in demonstrations, the only effect was a very clean engine. It had no effect on all the vehicles we tried sometimes using detergents and heated water. They went bust after the owners disappeared.
Vehicles are designed to have a tidal wave of water thrown in the front at 70mph + headwind for hours at a time. There's plenty of online videos online of people jet washing down their engine bays. I wouldn't do it while it's running and probably not while it's baking hot, and wouldn't deliberately point it at the intakes or electrical bits, but jetting at solid surfaces isn't going to harm it.
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SIL alternator failed on his car after going through a big puddle.Would you expect your Alternator to be OK after dumping it in a bucket of water. Circuit boards of any kind shouldn't be wet especially not if they are powered up.