I’m very OCD about the dish sponge (and many other aspects of my life), so I change it once a week. But I’ve recently started zapping it in the microwave before each use, so maybe I’ll be wacky and go 2 weeks before changing them. 

Here are some tips from Real Simple on maintaining bacteria free sponges.
Rinse and Dry After Every Use
A damp, dirty sponge encourages bacteria growth. But it’s not enough to squeeze out the dishwater, says Sparacio. Once the soapy water has been released, rinse the sponge under hot water. Then press out the water (wringing will damage the fibers) and place the sponge on a rack, not under the sink. Allow it to dry fully before the next use.
Disinfect — and Do So Often
Because bacteria are invisible, there are no telltale signs you can see to indicate when you should disinfect. “If your sponge has an odor, it definitely means bacteria are growing,” says Smock. “However, a lack of odor doesn’t necessarily mean a lack of bacteria.” So, better to err on the side of caution. If the sponge has gotten wet and has come into contact with food products or human or animal blood, it should be disinfected before being used again. Simply zap the sponge in the microwave for two minutes on high or run it through the dishwasher.
Learn When to Let Go
“How often you should throw away your sponges depends on how well they’re cleaned and disinfected,” says Smock. If they become brittle or smelly, it’s definitely time. Otherwise, tossing at least once a month is a good rule of thumb.
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