Tried and true ant (and flea, and cockroach, and moth, and tomato worm and, and ,and......) solution is Diatomaceous Earth. Sprinkle it when they are coming in the house. They will carry it back to their nest. The diatom fossil bits cut their exoskeleton and they bleed to death. It will kill a whole colony in no time - and it is non-toxic and organic.
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