I had a problem with ants a couple of years ago, and swear by Nippon ant killer, the one that comes in a tiny tube and looks like syrup. The ants take it back to the nest and feed it to the queen and any hatchlings, so while you won't see any visible reduction in ant population this year, by next year there will be no ants. Dot it around in several places especially where the ant 'runs' are.
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