P.D.
E.:
my understanding is that ants come in for water... you can try putting boric acid where you believe they are coming in.
otherwise i would call Rick at A Plus pest Contro. ###-###-####. They use products that are enviromentally safe.
website: www.apluspest.com
P., RLC, IBCLC
Pres. Lactation Support Group, Inc
www.lactationsupportgroup.com