Stop! If you're on after-dinner dish duty, you might want to think twice before reaching for your trusty kitchen sponge. According to a 2011 NSF household germ study, there's an average of 321,629,869 microorganisms living in every gram of your used dish sponge. Yuck! To clean up your dish washing routine, clean your sponge each day. You can kill bacteria with heat by microwaving a damp sponge on high for one minute, or by soaking it in a solution of water and a small amount of bleach. Ultimately, to effectively combat grime you may need to replace your sponge more frequently. If you'd rather not pay to replace yours, switch to a dish rag and toss it in the wash frequently to zap germs.