I noticed a bird with mites in my flock. Quickly inspected everyone and only a few seem affected. I scrubbed out the coop and told DH to get permethrin from the feed store. He came back with pyrethrin. I can't find as much about it; I mixed it 1 tbsp to 1 gallon and have some in a spray bottle. I used it to kill mosquitoes on the porch, but I'm nervous about the chickens. Should I just spray under the wings and on the vent, or should I dip them? Can I soak the coop in it?