Kitchen sponges
In nearly every part of the world this is notoriously the dirtiest thing in the house. With 10 million bacteria per square inch your kitchen sponge is nearly a quarter of a million times dirtier than your toilet seat. Having absorbed the fecal matter of everything from humans to cows as well as a multitude of other much more terrifying bacteria we would highly recommend that you change your sponge…like right now.
Besides, if everything was laboratoy-clean, we would be sick 24/7. We are supposed to be in touch with bacteria, so our system learns how to reject them.