Your kitchen sponge harbors lots of germs that don’t get killed by merely rinsing them and you wind up spreading germs with every swipe. Each day clean your sponge with soap and rinse and then zap in your microwave for a couple of minutes. Replace sponges about every 2 weeks to be safe. You can also clean your sponge on the top rack of your dishwasher (make sure it’s secure) or in your washing machine.