Giving your house a thorough vac on a regular basis will also effectively rid of egg sacs and webs that have already formed in your house. (businessinsider.com)
It's not unusual for spiders to stash egg sacs in web debris. (newscientist.com)
In fact, Marie found it in 31 % of the Tahitian brown widow spider egg sacs that were dissected. (sciencedaily.com)