Ants have invaded my home too. They started out in the bathroom around the flush and the tub, must have been the water attraction there. Then they proceeded to invade the laundry basket, the walls, and on into the kitchen before I finally found what works for me... Raid ant killer in the liquid form.   Just a few drops left in strategic places had them gone in less than a week. It acts like a food attraction and they eat it up and take it back to the colony where they feed it to the others . Haven't seen any in a while although I am paranoid now when I sit on the flush, I have to check it for critters. LOL Any way , This stuff comes in a 100 ml red plastic bottle. I got mine at the grocery store but I imagine it is everywhere. Contains 7.7% Borax.   Now if you have any cures for Mozzies and blackflies......:o)   VF