I seem to try to answer a lot of questions I don't really know the
answer to. Ants are insidious, I had this deal in a shed and was
amazed at how they just turned the whole thing into their habitat. I
ended up tearing down the shed and having it hauled away so I don't
know your answer but wanted to suggest that even if you think you have
them beat that you may want to have someone come out and inspect and
treat. they could be in parts of you house you can't even reach or
whatever.

i've had a wall full of bees one time too. could hear something
buzzing but could not figure out what it was for the longest time. it
was a giant bees nest between 2 studs in an exterior wall. bees were
coming in and out of a hole in the caulk outside that was a hair wider
than a bee. in the warm weather there'd be a big cloud of them and i'd
spray them and fog them and whatever and there were always more.
finally i had to put up a ladder (their access hole was 25' up) and
take a tube of caulk and a fire extingusiher up with me. hit those
suckers with the fire extinguisher, which rocked their boat, and then
filled up the whole with caulk. they all died inside the wall, i went
in from the inside to check later.

home ownership...priceless.