Talcum powder works fantastic with ants. I will never buy ant powder again.

The bastards invaded the cats food, so I sprinkled some talc around the bowl (not on the bowl, obviously...) and within 30 seconds they were all gone and haven't come back. They fkn hate the shit.
Of course the cat then looked like a crack addict and left white footprints over the carpet, but she did smell nice.