http://www.amazon.com/Termidor-SC-T...=UTF8&qid=1436063369&sr=8-1&keywords=termidor
Get a 1 gallon pump sprayer. Spray this on your stacks. Around your house, and inside your house.
Will kill all crawling insects. It is very non-toxic imo. The ingredient is Fipronyl. It is the same product in Frontline the the flea and tick medication you put on dog and cats backs.
Edit: btw it isn't an immediate kill. They pick it up, take it back to the nest, and it wipes out the whole lot.
I swear by this chemical (it's generic brand Taurus) but I do insist on following the directions which are pretty specific about no spraying it inside the house. It's good stuff that the general public doesn't have access to unless you claim to have an applicator's license.