when you have a real nice spring day, and yes they are coming lol, take everything out of the coop, bedding mainly and toss it. Then get some sevin spray you mix it in water according to directions, then go in and open all the windows and doors make sure chickens can't get back end till it's all dry which on a nice day shouldn't take but a couple hours, spray everywhere top to bottom being sure to get into every crack and crevice. you'll also need to treat your flock again if you only treated the one time, I like to use Epernix pour-on, it's easy to use, and theres no egg with drawl. you apply to the lower part of the neck where the wings start making sure to get it on the skin. I do it now as a percaution since our out break last fall. Epernix will also treat them for internal parasites. Then after treating your coop put in new bedding, I use powder to treat around the areas where they spend time dust bathing or just laying around. all the best and Happy Spring!! I also gave scratch during the coldest part of winter, now I mix about 8 to 10 lbs. to a 50 lb. bag of Flock Raiser to feed the rest of the year. Everyone has their own way of feeding their flock this just works for mine I am by no means an expert..