A few months ago, my chickens got sick. I have no idea what they had, and the only symptom I noticed was sneezing. I told a local farmer of the situation, and he came and took the chickens, as I just didn't know what to do, and couldn't kill them myself if that is what was to be done. My coop has been empty now for about 2 months. I want to get new chickens, but I am afraid of germs still being out there. It is a wooden coop, so there just isn't a way to completely clean it. Is there anything I should do to the coop and run before adding new chickens?