We have an ant problem. We've tried several remedies and things improve for a little while. And then you notice that everything in your house seems to have at least one ant on it.
I tried asking them to leave. I threatened them with poison. It didn't work.
Then I found Terro. It lures them in and then they take the poison back to their nest.
Which, apparently, is in the wall behind our power outlet.
I haven't seen an ant in 2 days.