Karen,
Permanant? Nothing. They can be carried back in the next day.
Pre-treat? Yes!
Go to DoMyOwnPestControl.com to read up and buy their BB kit, $78.
1. Remove suspicious items
2. Bag clothing, wash in HOT HOT water and HOT HOT dryer. Place in a fresh bag.
3. vacuum like crazy, esp in cracks.
4. Spray to kill
5. Puff Delta Dust or Diatomaceous earth for residual protection
6. Caulk every crack.
--68.50.xx.xxx