Last year a day or two before leaving on an extended vacation, we were bombarded with an invasion of ants. Someone suggested Terro Ant Killer and it is the best. It is a 2 oz. bottle with some cards. You can buy it at Home Depot, Lowes, Target, Walmalt, etc. You put a few drops on a piece of the cardboard and place it in the ant trail. The ants are attracted to it and take the solution back to their nests. Within a day the ants were gone and we haven't had them back. Good luck.