How to Sanitize a Sponge

2 Materials
2 Minutes
Sponges are some of the dirtiest things in a kitchen. Even though we use them to clean our dishes, get food stains off of counters, wipe up messes, etc. they can get pretty dirty, and it's important to clean them between uses. Imagine wiping the spot where you just cut up raw chicken and then wiping a dish with the same sponge - gross! Even regular use allows bacteria to grow, because the sponges are always damp. Call me a germaphobe, but I'm getting squeamish just thinking about it. Sponges should be sanitized every week or so, and I have the easiest and most efficient way to do it!
My trusty sponge at work. I had just cut up a tomato for my salad and some of the juice spilled onto my counter.
Step 1: Wet the Sponge
Make sure your sponge gets actually wet, not just damp.

Step 2: Microwave Your Sponge
I microwaved the sponge for 2 minutes. Depending on your microwave, you might have to put it in for longer.
Two minutes was enough time to get the water to boil. You might need to set the time for a minute longer.

Step 3: Let it Cool
The sponge is literally boiling hot, so I had to wait until it was cool to pick it up. Be careful when you touch it!
Now your sponge is all clean, and you can continue using it for whatever you want.
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Frequently asked questions
Have a question about this project?
3 of 8 questions
  • Jeanne Jeanne on Apr 03, 2021

    Is it ok to spray with Peroxide before putting in the microwave? That’s what I’ve been doing for awhile now and it removes that nasty smell in less than a minute.

  • Cecilia Cecilia on Apr 03, 2021

    I microwaved my sponge to sterilize it. last August. I put it outside on the porch because I thought there we’re fumes from the heat. It was hot enough to ignite the siding on the house, which burned through to the electric wires, which burned upward toward the ceiling. The flames spread laterally in both directions, and the house went up in flames. I not only lost my house, I lost everything I owned.

  • Lacey Lacey on Apr 04, 2021

    I’ve been putting mine in the dishwasher when I run it.

Join the conversation
2 of 128 comments
  • Marina Gonzales Marina Gonzales on Apr 03, 2022

    Not only is this an easy way to sterilize your sponge, but when you leave the hot sponge in the microwave for a few minutes after it turns off (without opening the door) the steam that is in there makes cleaning anything stuck to your microwave walls easier! ;)

  • Store them in the freezer after each use. Amazing