Terro T300 Liquid Ant Baits
Before calling an exterminator, try these Terro T300 Liquid Ant Baits. We have experimented with a lot of methods over the years, and these are the most effective poison, for small/sugar ants anyway. A few days, and they're all gone. Watch the ants for a bit and find out where they are entering a room, then put a trap in their path there.