Beware of dust rags, dishrags, mops and other cleaning tools. Unless sanitized between uses, they only spread around the germs you are trying to kill. "It's a free ride for the virus," says Gerba. Some of the cleanest houses he's tested had the highest germ counts. And get this: a few untidy bachelor pads tested very low for germs, which he attributes to lazy housekeeping. "They don't move anything around, everything is in the sink or the garbage."
But you don't have to descend into bachelor habits to defeat contagion. Gerba advises heavy reliance on paper towels. If you don't want to stockpile disposable towels, wash and dry cleaning tools at high temperatures so your house is clean and germ-free.