For the most part water does not hurt electronics, as long as they are dried out before power is applied. Most components are sealed, the only thing you have to watch out for are things like switches and pots where water can get in and it's hard to get it out. Like I said, I did it for years, I for a while I was repairing a lot of monitors and boards that had been exposed to cigarette smoke or machine shop coolant vapor. The stuff is nasty, leaves a sticky film all over everything. Normally I ran them through the dishwasher before I worked on them, made it so much more pleasant. Literally hundreds of boards, it worked for me, but YMMV. In retrospect the potential for lead contamination of the dishes is a somewhat of a concern but that's in the past. Now I wash in the sink with a toothbrush when needed, it's easier to protect the labels and keep water out of sensitive parts without removing them. Final rinse with isopropyl alcohol makes it dry out much quicker.
