Never use Nu-Stock near any mucous membranes and that includes the vent. It is a mange medicine labeled for horses and dogs that works well for scaly leg mites and that's it. Soap and water won't "clean" a coop. Disinfectants like Oxine AH, Biophene will, along with eliminating viruses, bacteria, fungi. Whitewash has mild antimicrobial properties but won't do much against external parasites. Emulsified concentrates of permethrin/Rabon-Vapona are preferred and labeled for use around and on poultry. Chemicals can be organic or synthetic. Permethrin is derived from pyrethrin, an organic chemical that comes from daisies.