[Brigliadore]

Do you have a china town like place near you? Chinese stores sometimes have this thing called Borax chalk. I am not sure that is how you spell it but anyways, its a white chalk like substance that you draw a line where ever the ants are coming in. Just follow the trail to the hole they are coming in from. The Borax chalk doesn't kill them they just don't like how it smells and how it feels as they walk over it. Borax powder and chalk is not harmful to humans so you don't have to worry if you use a little in the kitchen. After about a week when they are gone you can wash off any lines that are still present. They used to make soap out of borax back in I think the late 1800's and early 1900's. You may be able to find it other places (perhaps a hardware store) but I don't know, when ever we got it we were in L.A.'s China Town so the box always had Chinese writing on it. Good luck.