I think I've got mites. I picked up a chicken and found myself with bites the next day. I got these chooks at about 4 mo. I've got a little Catawba coop so I will clean everything out. I happen to have Sawyer's permethrin spray for clothing. Any thoughts on using it on the coop and roost, then letting it dry while the girls free range? Best treatment for the chooks? DE? Sevin? Thanks.