I had the same problem earlier this year, my roommate launched a one man war against them and they never came back. Here's some tips I got from a website. Good luck.
Keep ants from getting into pet food dishes by placing the dish with the food inside another shallow, bigger dish with an inch of water in it.
Ants don't like the smell of peppermint. They'll avoid anyplace that smells like it, so start inside with the places you think that they might be entering. Next, do the outside where they might be coming in.
Possibilities: peppermint flavoring (used for baking), peppermint tea, and if you have a health food store nearby-*Dr. Bonner's peppermint scented castile liquid soap*.
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Keep ants from getting into pet food dishes by placing the dish with the food inside another shallow, bigger dish with an inch of water in it.
Ants don't like the smell of peppermint. They'll avoid anyplace that smells like it, so start inside with the places you think that they might be entering. Next, do the outside where they might be coming in.
Possibilities: peppermint flavoring (used for baking), peppermint tea, and if you have a health food store nearby-*Dr. Bonner's peppermint scented castile liquid soap*.
http://www.tipztime.com/area/bugtipz/ants.html