Terro! Use extra caution if you have kids or pets. It’s mostly just boric acid (similar borax laundry additive) but still best to be careful. Tear off pieces of the cardboard box and squeeze a big drop on to it. Put it where your seeing ant traffic, off in a corner or window sill, somewhere out of the way but where they travel. After 4-12 hours they’ll all be circling around to drink the yummy juice. Resist squishing them. Let them bring it back to the nest. Keep refilling the circle as necessary. And if a bunch start coming, put out more circles of Terro. By 48 hrs carpenter ants usually done and gone. Definitely by 4 days. I’ve had sugar ants gone in under 12 hours. Terro causes ants gas but their physiology doesn’t allow for burping or farting. They die of a killer fart they just can’t pass.
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