Russ

The research behind this is wild. Your kitchen sponge has the same density of bacteria as human stool. German scientists found 54 billion bacterial cells per cubic centimeter inside used sponges in 2017. Yours is sitting right next to your sink. Sponges are the perfect home for bacteria. They are wet, warm, full of food bits, and never fully dry between washes. Across all 14 sponges, the team found 362 different types of bacteria. The most common species include strains that can make people sick. In 2011, the public health group NSF International swabbed 30 things in 22 American homes. The dirtiest object in the entire house was the kitchen sponge. It was dirtier than the toilet seat. 75% of the sponges tested positive for the kind of bacteria that includes Salmonella and E. coli. Microwaving does not clean the sponge. The 2017 study found microwaved sponges had higher amounts of the smelliest, most harmful bacteria. Heat kills the weak strains. The strong ones survive and refill the sponge with no competition for space. A 2021 Norwegian study compared kitchen sponges to dish brushes. In brushes, Salmonella was wiped out within three days because the bristles dry out between uses. In sponges, bacteria climbed to about a billion cells per sponge. The lead researcher told CNN that one kitchen sponge can hold more bacteria than there are people on Earth. Three things actually work. Switch to a dish brush, because brushes dry fully between uses while sponges stay wet for hours. Replace your sponge every one to two weeks. Never leave it sitting wet in the sink. Norway and Denmark already do this by default, but most other countries don't. The detergent is fine. Your sponge is the problem.

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