Microwaving Your Sponge Makes It Dirtier
Many websites advise people to clean their kitchen sponge by heating it in the microwave. They claim that heat will kill bacteria–and they are partially right. It kills the small, harmless bacteria and leaves stronger pathogens. Some of these are the same bacteria in human stool.
Research in Scientific Reports found that microwaving a sponge helps dangerous pathogens grow. In other words, heating your sponge results in more bacteria. You’re better off replacing your kitchen sponge every few weeks.
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