Clean with vinegar and water on counters and floors. This will not hurt any kind of flooring and keeps ants from coming in.
Try sprinkling talcum powder thickly across their tracks -especially at the points where they are entering the house.
Recommended by exterminator during his last visit to my home:
Food grade diatomaseous earth works better than talcum. It causes them to dry out and die.
Another remedy is borax or boric acid available at your drug store. It causes their exoskeletons to dissolve. Virtually harmless to humans.
Yet another remedy is cream of wheat (uncooked)-- they eat it, it expands... and pop! They die.