Combat Ant Killing Gel
When you know where ants are coming in and you want to head them off at the pass, try Combat Ant Killing Gel. This gel comes in a syringe, so you can apply it virtually anywhere that there is a known ant trackway. You can place this gel directly in their path so the ants have to stumble on it, and once they do, they will swarm over it and consume it. The active ingredient is fipronil, which is a nervous system disrupter. It works slowly so that the foraging ants will take the food back to the colony, share it with others and the queen, and the entire colony will die. It is exterior grade, so it is just as effective inside and out.