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From: Minnesota in the summer, Las Vegas in the winter
I power wash the motors in both my corvettes and daily drivers with my 2000psi sprayer every summer. NO PROBLEMS EVER. In fact, when I got the 91 I think I had to power spray it about 4 times in a row to get the crap off of it. Wiith degreaser and other chemicals.
I steam clean mine periodically...I just make sure to cover the opti area real well first.
Never had any problems and my engine/suspension always look great.
I can't take it that far, because if I get it that perfect, my OCD will kick in and I won't want to drive it, and I lose the true value of having the car, driving it.
Still, I admire the work and would hire you to do mine once a year...