If you don’t know already, your kitchen sponge is one of the dirtiest things in the world. And washing it in just water is not going to get rid of all these bacteria for you.
Fortunately, there is a trick that you can employ. But this trick, however, will only work if your sponge does not have any metal or plastic parts.
All you have to do is, keep your sponge in the microwave for some time and heat it. Your sponge needs to be completely wet before you place it in the microwave. This would kill around 99 per cent of bacteria in the sponge.