That'd be Gardstar Garden & Poultry Dust, 0.25% permethrin, available at TSC.As you're going through all the work to thoroughly clean that NICE coop, you may consider prophalactically dusting it with mite/tick powder that's safe for chickens. The name of the active ingredient escapes me, so hoping someone will chime in with the generic or brand name of the stuff I'm talking about.