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Borax is a cleaning chemical that is poisonous to ants, but non-toxic to humans. To try and kill the ants at their source, make a Borax bait that the ants will flock to, and bring back to their nest. Mix one part corn syrup (or any sweet, sticky substance) with one part Borax, and spread the mixture on an index card. Place the index card in an area where you have witnessed a lot of ant activity. The ants will bring this sweet, poisonous mixture back to their colony, and it will slowly eliminate the ants.  Consider setting this bait at night, because ants tend to hunt for food during the night hours.  You could also make a poison mixture with Borax and powdered sugar. Mix together 1 part Borax with 3 parts of powdered sugar. Fill small containers with this mixture (bottle caps, spoons, etc.), and place these containers around areas where ants may be entering your house. If you have pets or children who could get into this powdered Borax mix, consider mixing 1 cup of warm with ½ cup of sugar, and 3 tablespoons of Borax. Soak cotton balls in this mixture, and set the cotton balls out in shallow dishes near known ant entry points. Commercial bait traps eliminate ants much the same way as Borax traps, but they tend to work a bit faster (although they are still slow-acting), and can be more targeted to specific food preferences of your invading ant. For example, there are ant baits that are sugar based, grease based, and protein based depending on what kind of ant you are dealing with.  When in doubt for what kind of ant bait to use, consider getting one of each.  If you find that the ants are not taking the bait, you may have to change the type of bait you are using, or relocate the bait to a more active area.  When using bait, all other food competition must be removed from the area. This food competition could inhibit the effectiveness of the bait. When the ants start feeding on the bait, leave them alone to feast and bring it back to their colony. After some time, you should see a reduced number of ants. If you are able to follow an ant trail back to a nest or anthill, consider pouring salty boiling water down the hill opening. You may have to use many containers of water, but this will be a surefire way to eliminate a large amount of intruding ants.
Poison the ants with Borax. Set up a commercial bait trap. Pour boiling water over the anthill.