I heard this on the John Tesh Radio Show - wet it & nuke it in the microwave on high for 1 minute every 4 days. Here's the info copied from his website:
Methods for Disinfecting a Kitchen Sponge
We're ready to guide you through the cleaning of the single germiest thing in your house. The kitchen sponge. Researchers at the USDA tested four methods of disinfection and we found their results in Prevention magazine.
Here they are from least effective to most effective.
First, know this. To stay safe, you should disinfect your sponge every four days. It’s the perfect breeding ground for bacteria because it’s moist and filled with food particles. So, let’s look at the least effective method of cleaning the kitchen sponge:
You may have heard that soaking it in lemon juice for a minute would rid your sponge of germs. Not so. Soaking it in lemon juice had practically no effect on bacteria, yeast or mold.
Next, the researchers tried soaking the sponge in a bleach solution. It killed more bacteria than the lemon juice, but not all – and it had no effect on yeast or mold.
The third test the researchers tried was to run the sponge through a complete cycle in the dishwasher – including the hot air sanitizing drying cycle. That method was pretty good. It was almost as effective as the #1 solution for disinfecting a kitchen sponge.
Nuking it in the microwave on high for one minute. Doing that kills virtually all bacteria, yeast, and mold. Just make sure the sponge is wet first or it might burn up in the microwave.
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