I just happened to read an article today linked from msn.com. It said to use Borax:

Baseboards, countertops, and walls: Dissolve 1/2 cup borax in 1 gallon hot water and pour the solution into a spray bottle (which you can store for later use). Spritz generously, wipe down with a damp cloth, and let air-dry.

Here's the article:
http://www.realsimple.com/home-organ...547/page5.html