This linked site http://www.ext.vt.edu/pubs/entomolog...2/444-422.html
suggests using a vacuum cleaner, then removing the bag, then tossing the bag away.


"Removal: If you discover a widow spider in or around your home the safest way to remove it is with a vacuum (hose attachment). With a vacuum you can remove the spider, the web, and egg sacs all in one safe step. Be sure to remove the bag from the vacuum immediately after use and throw it away outdoors."