Does anyone know of a natural/green ant killer?

I have little grease ants coming into my house. I do not see where the chemical trail is, and it is just one to two every so often. I HATE these little stinkers and since I have two cats I would like a natural way to keep them outside and not in my house. I have tried chalk, ant bait...still I found them... show more I have little grease ants coming into my house. I do not see where the chemical trail is, and it is just one to two every so often. I HATE these little stinkers and since I have two cats I would like a natural way to keep them outside and not in my house. I have tried chalk, ant bait...still I found them crawling on my sink. No water is in the sink...so they have no water source. No food is out...counter is spotless. All food is in tupperware or sealed containers. HELP!!! Thanks in advance.
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