We may earn commission from links on this page, but we only recommend products we back. Why trust us?

How to Clean a Sponge and Kill Bacteria

Turns out, microwaving it isn't your best option.

No one likes the idea of cleaning dishes with a germy sponge, which is why we all know we should be cleaning ours on the regular. But which method is best? The Good Housekeeping Institute worked with EMSL Analytical Testing Lab in Westmont, New Jersey to find out if using the dishwasher, microwave, washing machine, bleach or vinegar removed the most bacteria — and bleach won.

The Best Way to Clean a Sponge

Below, you'll find the best step-by-step method for cleaning a sponge. But no matter how diligent you are about cleaning, your kitchen sponges won't last forever. You need to clean them weekly, and toss shabby ones every two to three weeks, depending on use.

  1. Mix 3/4 cup of bleach in one gallon of water.
  2. Soak the sponge in the mixture for five minutes, then rinse – and that's it!

    In testing, the bleach solution killed 99.9% of the three bacteria strains from the test sponges (scrub and regular cellulose), which is the benchmark based on the EPA's requirement for sanitization of non-food-contact surfaces.

    before and after cleaning a pink white and yellow sponge on colorful terrazzo surface

    3 Alternative Ways to Clean a Sponge

    Even though bleach is the most effective bacteria killer, in a bind, these methods are your next best option. They're listed in order from most to least effective, so choose wisely.

    • Microwave: The microwave was one of the next most effective ways to clean a sponge, zapping 99.9% of germs. Do this by saturating the sponge in water (we used 1/4 cup for scrub sponges and 1/2 cup for cellulose), putting the sponge in the microwave, then heating it on high for one minute (scrub) or two minutes (cellulose).
    • Dishwasher: The dishwasher also killed 99.9% of germs. To use, add your sponge to a regular dishwasher load, using the "heated dry" setting.
    • Vinegar: This method eliminated 99.6% of bacteria. All you have to do is soak your sponge in full-strength vinegar for five minutes, then rinse.
      This content is created and maintained by a third party, and imported onto this page to help users provide their email addresses. You may be able to find more information about this and similar content at piano.io
      Advertisement - Continue Reading Below