2. Kitchen sink
"There's usually more fecal bacteria in your kitchen sink than in your toilet bowl after you flush," says Gerba — whereas many people clean the toilet regularly, they only rinse out the sink. But because your sink is often wet, bacteria from uncooked meat products grow quickly there. Stainless steel sinks should be scrubbed daily with disinfecting cleanser. For ceramic or cast-iron sinks, use diluted bleach (1 tablespoon of water in a gallon of water).