From June 1-July 31, 2016, get a free spray bottle when you buy ten 2-oz. packets of Maxforce Fly Spot Bait. The bait controls house flies indoors and out, including non-food areas of commercial food-handling establishments and animal facilities. It’s easy to apply (mix in water and spray), and results occur within 60 seconds, the company says. The residual lasts up to six weeks indoors and 30 days outdoors.