Go to Wal-Mart and buy a couple of insecticide generators. They are usually in the paper goods and chemicals section of grocery. These are the things that started out in the seventies as the Shell No-Pest Strip. You simply hang as many as needed in the space you want to clear out and the vapors do the rest. There is no odor, poison that affects humans, etc, although you cannot hang one in the pantry. Bad idea.
Crickets, mosquitoes, spiders, flies, moths, etc will be killed. They cost about $5.80 and last for up to four months depending on the ventilation of the area being treated. Each one treats up to 900 cu ft. Farm supply outfits sell them but they are more expensive for the same thing.