I have a minor ant problem in my apartment, which is maybe 90 years old. They are in the kitchen, pantry and bathroom which are adjacent rooms. Although there are ant killers out there, is there a particular type to buy?
Our neighborhood has had this trouble for years. We use granules around the outside of the house and gels inside the house and nothing stops these guys. They just keep coming and coming. Even if we keep the house 100% clean all the time (which isn't happening with three kids) the ants come after any single drop of moisture on the counter, bath, sinks, etc. Sorry not to have positive advice, but that is what we've found after years of fighting.