I’m not sure this counts as ‘Social Design’ — but then the sickness it can spread. And I love simple solutions like this.
If you’re a busy designer, you probably don’t change your kitchen sponge very often. When things start to smell, it’s seriously past time to do something about it. From Cook’s Illustrated:
Safer Kitchen Sponges
“Sponges kept by the sink are wet and warm, which makes them attractive hosts for bacteria. We investigated various home-style disinfecting methods used by readers and test kitchen staffers — microwaving, freezing, dishwasher, bleaching, boiling, and washing with soap and hot water — to see which were effective. After counting bacteria both before and after testing, numbers showed that putting the sponge in rapidly boiling water for 3 minutes was the most effective disinfection method, reducing bacteria counts from millions to only 1,000. Soaking the sponge for ten minutes in a solution of 1/4 cup bleach and 4 cups water was the next best alternative.”