In the December issue of Journal of Environmental Health a study involving sponge germs revealed that a quick spin in the microwave left kitchen and bathroom sponges virtually germ-free.
Researchers concocted an awful mix of things we won’t mention here and then soaked their sponges in it. After 2 minutes at full power, 99 percent of germs were terminated. Four minutes were required for B. cereus spores, known to be tough little critters to kill.
Although most of us would never subject our sponges to the kinds of things the laboratory sponges fell victim to, our sponges do encounter pathogens all the same (eggs, meat, etc).
The method is simple and quick: wet your sponge and place it in the microwave at full power for 2-4 minutes. Do this every other day.