Harmful bugs can thrive in your kitchen sponge for weeks – and you won’t be able to tell

That kitchen sponge by your sink is far more dangerous than it looks. German researchers found that harmful bacteria—Salmonella, E coli, and Staphylococcus aureus—can survive inside sponges for at least two weeks, even after drying out. They form sticky, protective layers that resist removal, and, per The Conversation, a single wipe of a contaminated sponge can transfer these germs directly to your kitchen surfaces. The problem is structural: sponges' porous design traps water inside, creating ideal conditions for bacteria and mold. Bleach also becomes less effective on well-used sponges. If you want safer alternatives, dishwashing brushes dry faster and carry far fewer harmful bacteria. For those who stick with sponges, use paper towels when handling raw meat, spray your sponge with disinfectant throughout the day, and replace it weekly.

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