I had problems when I lived in Salem.....many years ago -- I SWORE the town of Salem was one big ant hill! At one house, I opened the dishwasher AFTER it had run its cycle and half way thru the drying --- steam hit me in the face and ants were running all around inside! I couldn't believe it! I looked in my arsenol (cleaning equipment) and saw some LimeAway ---- with a black skull and crossbones on it. HEH HEHE If it'll kill a human, it's BOUND to kill ants! I squirted that stuff under the dishwasher, INSIDE the dishwasher and went outside and squirted all around the house. Bought two more containers to get everything done. I NEVER had another ant at that house again! Course, it's a toxic landfill now -- but NO ANTS!
My Step daughter was having big time troubles in GDs bedroom. She finally started taking every toy and piece of fabric out of the room to wash ------she found they'd made nests in the white rods that hold curtains!!!!!! UGH!
Good luck!!!