I had used Pine Sol on the door stoop for years and never had ants, now we have had fire ants out in the yard, and I was told to use club soda. Since there tunnels can be 30 ft or more, the soda smothers them. Seems to work. Or they just moved away which is okay by me too.
Use instant grits with some crushed potato chips in the area where they frequent. The oily chips attract them and they eat the grits and explode as they expand in their stomachs. Sounds gross, but it works. They take them back to their nest too. Worked for me.
I can't find the source of where the ants are coming from. Any suggestions?