So I made a mistake... I treated my chickens with Permethrin powder without realizing how much of a mess it would make. I have three indoor/outdoor cats that love to go and watch the chickens during the day and will inevitably walk through the powder that's sprinkled throughout the grass. In retrospect I would probably have tried to find an alternative method to treat for lice/mites but I can't go back now. What's done is done. How long should I wait before letting the cats out of the house? Would rinsing the grass off with the hose help out the process? I know Permethrin powder is not as dangerous to cats as the liquid form, but can anyone help me out with this?