I've used neem oil for mites and it works well! I mix 1 teaspoon of neem oil in a 1 pint spray bottle with water. Make sure to use warm water though so the oil doesn't separate. I spray around the vent area. The neem oil oils down the feathers and makes it harder for the mites to lay eggs.Put neem oil and dish detergent in warm water and soak the chickens 15 min once a week if they're itching all over