The engine bay in my Buick is absolutely filthy, and I'd like to make it pretty for my own vanity, and for tech inspection tomorrow. How bad of an idea is it to just take a power washer to my under-hood region as long as I avoid spraying the massive wiring harness on the right side? There isn't any worries of hitting my battery, which is in the back (for better weight distribution, probably), and everything else electrical is sealed up rather well.

My engine had a few bad seals last year and it's kinda doused itself in 14 different kinds of automotive bodily fluids and they've all gotten completely stuck on every surface. Going to a car show yesterday and seeing all of the pristine engine bays made me feel inadequate.

So... power washing engine bay. Yes or no?