When we had a pretty serious ant infestation a couple of years ago, this is what finally worked for us:
Take something like a yogurt container lid and put inside it a mix of equal parts sugar and borax (doesn't have to be a lot). Add just enough water to mix it into a paste-like consistency and place it in the tracks of where the ants go. Once they find it, they bring bits of it back to the nest and within a couple of days or so, no more ants.
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