We just recently had little black ants invade our house while we were away on vacation. By the time we returned, they were EVERYWHERE! We immediately purchased Raid and used it everywhere we saw the ants. It killed them on contact and we even found more ants and earwigs dead along the walls where we sprayed the next day! My only complaint is that I wish the effects lasted longer! After spraying an area, it would stay ant-free for a day or two, but we had a couple more occurrences of ants and had to re-spray. They eventually did go away though, and so far haven't been back!