So like pretty much everyone else I've got sponges in my kitchen. I use them for washing dishes and cleaning up the counter top. One thing that really grinds my gears is smelly sponges. I don't know if it's my water or what, but after a few uses my sponges start to smell musty. I've discovered that if I microwave my sponges for a minute or two after I use them it removes a good amount of the water and makes them odorless. I can't claim that this sanitizes them as I am not a microbiologist, but that would be my guess.