“Your kitchen sponge is capable of holding as much bacteria as a toilet. A study from Scientific Reports tested 14 used kitchen sponges, finding zillions of microbes in each.”
Top Signs It’s Time to Replace Your Kitchen Sponge
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To kill bacteria in the microwave, remove any handles or hard pieces from the sponge. Then wet the sponge and microwave it for 60 seconds. Allow it to cool for a few seconds before removing it.