Drum roll, please. The germiest item in your household is - ironically - the item used to keep things clean. That's right, sponges and dish rags. In the study, 77 percent harbored coliform bacteria, and another 86 percent contained yeast and mold. Even scarier, 18 percent contained staph bacteria.
Cleaning tip: Microwave wet sponges once a day for two minutes, and replace at least once every two weeks. If you use a rag, toss it in a hot washing cycle every day or two.