We have had quite a problem with a resilent strain of ants this year in my kitchen. I have tried the Raid Ant Bait hotels AND sprayed inside and outside me perimeters with Ortho Home Defense, to NO avail.
My daughter shared a natural and cheap remedy with me that she caught on Facebook, and it worked within 24 hours, and I am not kidding!
Natural Ant Remedy
Mix 1 cup of sugar, 3 Tablespoons of 20 Mule Team Borax laundry booster and 3 cups warm water. (I mixed in a quart-sized mason jar, and stirred until sugar and Borax dissolved). Store in a sealed and labeled jar. Place mixture in shallow soda bottle caps, milk jug cap, etc. out of reach from pets and kids. (A little goes a LONG way). Allow ants to drink mixture, but do not kill them! They will take the mixture back to their colony. In a day or two the entire colony should be gone.