Boric acid is GREAT. You have to order through a company (we use Carolina Biological Supply since the town is about 30 minutes away from ours). You soak cotton balls in a boric acid/water mix (it should come with directions or you can look it up), and the put clusters of cotton balls around the infestations and the boric acid kills them off within a few hours.
There was an ant infestation in the mailbox once, so bad, there was about 2000 ants in there. A few cotton balls and hours later, they were ALL dead.
Octavius - Male Halfmoon [02/19/11]RIP
Nero- who had been living under the moniker of "Hestia" for the past two months. Poor boy. [02/28/11]