The closest I've come to washing a rooster was cleaning them up after they got into a fight. I had several roosters eyes get crusted shut from blood when they fought. Never had one lose an eye though.
My MIL is the queen of incomplete research. When she and my FIL moved up here the year before we did, she was talking about wanting to put a swamp cooler in rather than air conditioners in the old farm house. She went on, and on, and on about how great swamp coolers are. I did a little research since I'd never heard of them. You need UNDER 50% humidity, ideally 30% or less for them to work. We are RARELY under 50%. She pouted about that one for a while.