[zara cybele]

Menthol Crystals used in the car will kill bugs. The most effective way is to get a "Mr. coffee cup warmer" and put a small cup on it with some menthol crystals. The crystals will melt and give off a very strong minty scent. Menthol works great in small spaces where it really can concentrate.
I'd leave it on overnight or 24 hours if you are totally paranoid.
mountainroseherbs.com sells it.
I tent my computer chair with plastic as well as my couch and place the menthol crystals underneath them and it works.
I also have a little "decompression" chamber where I mentholate some of the items I'm putting in the trash (people go through the trash in my neighborhood so I want to protect them from exposure).