This article is from the Fleas, Ticks, and Your Pet FAQ, by tittle@zmall.com (Cindy Tittle Moore) with numerous contributions by others.
Put flea powder in the vacuum cleaner bag to kill any fleas that you
vacuum up, otherwise they will crawl back out. You should change the
bag in your vacuum cleaner after a round of flea-cleaning in any case.
Moth balls can also be used, but they are pretty toxic. Sometimes
people put (cut up) flea collars in the bag, but it is not clear that
this is effective, and if the collar contains dichlorvos, is NOT
recommended.
 
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