I vote for the cayenne powder as well. I have always used this and it works. If the are ground ants and you can find their nest, sprinkle it also on it and pour boiling water down the holes to carry the pepper in.
My grandmother swears by bay leaves and baking soda/dough Like if you put dough/baking soda near where the ants chill they'll eat it, and it will expand in their stomachs and kill them. Or so my grandmother claims lol As for the bay leaves.. she keeps a few dried ones in her cabinets to keep the ants out and swears it works.. I mean she doesn't have ants but I don't know if she ever had any in the first place But I guess anything is worth a try xD
believe it or not. Cucumbers, They contain a chemical "trans-2-nonenal".. take a cucumber slice and wipe down the spot the ants travel. It will cover up their trail.. /
before i moved in here i went crazy with the caulking gun. but i am real weird about my house though, in a lot of ways... i have made this place like as much of a impermeable fortress as i possibly can......! it's an obsession...
Start frying some of them in olive oil and eating them. After awhile all the other little bastards will get the message.
LOL! I just finished a month long battle with them. They were coming into my bath thru various points, and they were gathering around the water spout for some reason. I would keep washing hundreds down the drain, day after day, and they would keep returning. They even got into my shower head, clogging it up! That was nasty cause when I'd turn it on they'd come out of the holes in bits and pieces and of course I had to put up with that peculiar smell of formic acid when they get crushed. I had a very difficult time getting them all out of the shower head. Finally I got a hot glue gun and covered up their entries to the tub area. Now they're gone, but still outside climbing into the house...but leaving us alone. They're probably in the walls...