This morning: - Spray the empty coop with bug killer - Wait an hour - Clean out all the straw and disassemble the coop's removable parts - Pressure wash the coop and parts - Spray the chickens with anti mite spray that can be applied to the animals directly - Let the coop dry somewhat, weather isn't ideal - Put in fresh straw - Edit: Treat the straw with Hypoaspis mites - As per the suggestion from @StabEm put out a litterbox with diatomaceous earth ... - Profit? Any comments? Edit 2, the outcome: https://poal.co/s/Chickens/774352