FWIW, i'm spraying all the bays in my new walls just as a precaution, that stuff is good for over 20 years!
if you have kids and/or pets, don't apply it anywhere they can get at it. a 100% safe alternative is diatomaceous earth, it does pretty much the same thing, but by abrasion, not poison. it's great for flea control as well! we get it at a local health food store.
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to see some of my original magic tricks and trick boxes!