If you're like most people, you use a kitchen sponge every day to clean your dishes. But is the sponge itself clean? The answer is probably no. "That thing is very dirty," Philip Tierno ...

Laziness is partially to blame (I struggle to go through my own skincare regimen these days, and you expect me to give my sponge a bath?), and the fact that I haven't really known how to clean a ...