Do you know why sprays don’t always work on ants?

What you see isn’t anything compared to what is below the surface. So if you decide to spray, you will only kill the ones in direct contact with the pesticide.  It is important to kill the Queen ant, when she is dead you will have accomplished the task at hand. Death to the entire colony.

My favorite for this job is TerroPCO, which we carry at our office.