ants on my kitchen counters, I spray with a glass cleaner (even the cheap ones work) and they drop in their tracks. (I do spray around on counter too and leave it to eliminate "trail" to lead others inside.) I do this about half a dozen days in a row (maybe 6-7 ants at a time) and then they are gone for months. We do not get them often. When they invaded in a hoard when the sugary liquid from the humming bird feeder spilled, I sprayed for 2 days on them on the front porch and they were gone! That's all I can tell you. It is not a complicated process! Since it is the season for ants to come inside, I keep some window spray sitting around handy on kitchen counter and on porches.

Oil, Ground up Chalk, Bay leaves. If they are red Fire Ants, you'll need the Pro's.

big, they'll get through those.