Take a new weed sprayer fill it with water and pour in drops of the essential oil Mela Plus, Purify or Deliverance. You can find any of these HERE. First clear out your sawdust or straw so the coop is completely cleared out. Now spray down everything.
Chicken Coop Disinfectant Recipe - orange peels steeped in vinegar for a month, then put in a spray bottle. Making my own would be much less expensive. It is sprayed inside the coop when I clean it to discourage mites, fleas, bugs, etc.
20 drops Rosemary essential oil 20 drops Lavender essential oil Inexpensive vodka - enough to fill whatever size bottle you choose. (I use a recycled 16 oz glass vinegar bottle with a dollar store spray top)