There are no cure all treatments for mites.You must know what kind of mites your chickens have. Apply treatments ever so many days prevents hatchlings from enjoying a blood meal. This will prevent any that hatch from reproducing
Ivermectin is effective getting rid of mites that live on the chicken (under the skin and feather shaft) Mites that live in the coop and feed off the chickens at night respond better to permethrin.Dips of permethrin are effective in getting rid of both but cold weather limits its use.