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After further observation, after an exterminator sprayed them twice a month apart, now 28 days later, we’re finding a mix of active ants and dead ants on the window sil in the early morning. I checked again a little later, and there’s no activity.

So the residual insecticide is still working some, but is not reaching the nest (of course), and not diminishing the nest.

And I can’t find an unsprayed place to put bait in.
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