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I avoid kitchen sponges.
Kitchen sponges can accumulate food and microbes when used for long periods of time and are not thoroughly cleaned. The moisture and food particles in a dirty sponge make it a perfect environment for microorganisms to grow (such as bacteria and fungi). Their waste products give the sponge a distinctive smell. If your sponge is smelly or over 1 month old, it's time to throw it away! Remember to replace your sponges every month with Calendar Sponge.