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A few years ago I discovered Terro brand ant poison. It's a solution of borax in a sweet liquid. I get it at the local Home Depot, but it's also at Amazon (of course). I buy the liquid and put a few drops in some bottle caps for the ants to find. A day or two later there are a lot of ants around the baits, then ... none. Sometimes there's a second "surge" but it also ends.
The poison works slowly enough that they take plenty "home" for the queen.
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