Did you know that your kitchen sponge is the dirtiest item in your kitchen? The small crevices of the sponge are the perfect breeding ground for millions of bacteria. When you use your sponge on a surface, you are wiping those bacteria all over whatever you are "cleaning". But don't despair, Sara Ellington and Stephanie Triplett, authors of The Must Have Mom Manual, have a great tip for killing those gross germs. Simply wet your sponge and pop it into the microwave for one minute. You should do this at least once a day, more if you can find the time.