I had good luck with House Guardian Insect Spray from Gardens Alive. Once I found where they were coming in I sprayed around the foundation outside and in the baseboard inside. Active ingredients are .30% Pyrethrins and 1.00% canola oil; it seemed to work for me. I needed to be careful as I had 3 kittens at the time. Before that I always used powdered Boron (spelling?)--not the cleaner but the stuff that used to be in eye wash, but I haven't been able to buy that for years now. The liquid baits also work if you don't have pets or kids to worry about. I haven't tried this but I read that you could mix 1/4 cup household sugar, 1/4 cup molasses, and 1 tablespoon yiest and slather it on cardboard pieces and place them in the ant paths. Supposedly it takes about a week, but the ants die after eating the mix due to the yiest expanding in their stomachs--basically blowing them up. Don't know if it's true, but if it is, it could be quite rewarding to see the little critters explode! Maybe it's like watching slugs explode after putting salt on them. I've seen that happen--learned it from my son--the things you learn from your children
