I was reading about mites it was on fresh eggs daily site. You mix 1 cup water to 1 cup veg oil and 1 tsp of dawn dish soap in a squirt bottle and spray everything in your coop. The oil smothers the mites so they can't breath. Now mites live for a week but each mite lays 100,000 eggs before it dies. you will have to repeat this almost everyday until you kill them all and don't see anymore.