When we would go to our cabin, in AK, we used a product - Scotts, Rose dusting powder - to kill all the bugs in the cabin. It has pyrethrins in it. Cut an aluminum pop can in half - clean and dry it on inside - put two tablespoons of the dusting powder in the pop can. Drop a burning farmers match down on the powder - in the can. It will start smoking and will continue for the better part of an hour. Best to have an outside activity when the powder is still smoking. It will kill ALL the insects inside a tent, cabin, out-house etc for the better part of three days.