I prefer to use ****roach baits (you know, they come in little plastic houses). I would rather use a small quantity of poison in a contained fashion rather than sprays. Minimises the total load of exposure on the family (IMO). Apparently if you sprinkle diatomaceous earth around, it cuts them when they crawl over it but I've always had reservations about having quantities of substances sprinkled around. I bet you could make your own bait using some sort of borax mix (works on ants) - google some recipes.