sorry to hear about the ants.. those things suck.. craw over just about everything and are hard to get rid of..
spray's don't do it.. powder works so-so..
one thing that works REAL GOOD is this certain type of poison
it comes out like a clear blue liquid.. maybe a tad thicker than water..
anyway the ants love that stuff.. they will all suck it down like it was sugar.. they eat it for a while.. then about a day or two later they will all be gone.. used it quite a few times.. if you have a LOT of ants it takes a day or two.. but if just a few they will probably be gone same day...
it doesn't kill them on the spot.. so there is no clean up either

well not as much.... they walk back to their nest and die pretty much
try orchard supply.. comes in a little plastic bottle..