Certain microwaves may require more time to sufficiently kill bacteria, or may not have wattage high enough to completely eliminate bacteria. Results can vary depending on the heating setting of your microwave. The results showed that sponges microwaves for at least 1 minute 2-3 times each week had significantly fewer bacteria than the untreated sponges. Ten of these participants were instructed to clean their sponges two to three times weekly in a microwave for at least 1 minute at a time at the highest wattage. Recent research has also supported this method.Ī 2020 study asked 20 participants to use kitchen sponges as normal for 4 weeks. The friction associated with this vibration causes increasing levels of heat, which kills the bacteria. That’s because radio-frequency waves in a microwave cause thermal (heat) and nonthermal (non-heat) effects, causing the water molecules inside a cell to vibrate. Department of Agriculture, found that microwaving a sponge killed 99.9 percent of germs - slightly more effective than throwing a sponge in the dishwasher. A 2007 study from the Agricultural Research Service, part of the U.S.
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