Prozap Garden & Poultry Dust,$6.99 for 2 pound shaker. The dust is very fine, smells like simple clay, is light gray in color. Active ingredient is 0.25% permethrin.
Dawn (not the antibacterial) dishwashing liquid to wash out the inside of the coop walls, roosts and floors. "Adams" dog flea & tick shampoo to bathe the infested hen.
I went back into the coop tonite to check the birds, no mites on me. Last night when we patted them goodnite, the mites swarmed all over our hands
so, the dust seems to work. Today, so far, no more mites.
...and, it was good hard work and a great little bonfire to clean out, wash up, and burn away their old cute basket and other infested decor. Tonite they sleep in hip, new plastic (mite-free) furnishings.
DH says, "maybe thats why the Egglu is plastic? Maybe they had a bad day with mites and learned the hard way......."