Depending on the species of indoor ant, a sweet bait is the preferred method to kill them. Ants leave a scent trail from the food source back to the colony. Baits will be taken back to the colony and, depending on the size of the colony, will be eliminated in several days to several weeks. It is important to maintain a fresh supply of bait until they are all gone.
Use an insecticide along the exterior foundation of the home in early spring. Seal small cracks and entry points where possible. Remove any food sources and place in the trash outside the building.
Checkout our Harris Ultimate Ant Control Guide