Heating it up
The things that you clean dirty things with, get dirty. That’s pretty unsurprising. So you might find yourself throwing your cleaning sponges away quite frequently, and bemoaning the cost. You don’t actually need to do this, though.
You can put your cleaning sponge straight into the microwave to kill the bacteria and microbes that you don’t want to spread around your kitchen. Make sure they are wet and put them on high for a couple of minutes. They’ll be good as new.