Dreft laundry detergent kills them. At my old house, we would sprinkle it around the outside perimeter of the house in the spring and fall. You just sprinkle it, then spray it with a garden nozzle, just enough to start it foaming, but not rinse it away.
In Process: Mango Beer, Homebrewers Pale Ale
Bottled/Kegged:Spicy Light Rye, Rice-adjunct Pale Ale, Mild Bourbon Porter, Roasty Stout, Basic Light Mead, Bourbon County Stout Clone
Up Next: Berlinerweiss, Chocolate Raspberry Ale, and American IPA