Use TERRO Ant Killer Spray inside and outside the home when it comes to ants and more. Killing ants, spiders, cockroaches, and many other insects, this truly will be a favorite spray to use against common household pests. When using this aerosol spray, get fast knock-down results and expect up to 6 weeks of protection from further pests. Apply in and out of the home in areas of concern for best results. Spray insects on contact if you can, or in places they like to hide. Some common spots include storage areas, sinks, plumbing, baseboards, and drains. For outdoor use, apply the spray in wind-free conditions to increase accuracy.