A few years ago, I read that microwaving kitchen sponges on high for one minute is a good way to kill bacteria, but a new study recommends nuking the sponges for two minutes to kill 99% of germs. Microwaving for four to ten minutes will kill just about everything. As an added bonus, I've found that microwaving prolongs the life of my sponges, too. So microwave those sponges, especially if you have young kids!
Note: Microwaving your sponge for 10 minutes can cause it to burn. (Yes, I learned the hard way.)
Note #2: At least I didn't come close to burning my house down.
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