What's the dirtiest place you regularly come into contact with? No, it's not the toilet. According to the Wall Street Journal, the average office desk may harbor 400 times more germs than the toilet seat. And the ATM machine may be no cleaner than the doorknob of a public restroom. Dozens of everyday objects you touch can be crawling with potent viruses and bacteria, poised to make you sick. Read on to discover 17 of germiest places you encounter and how you can clean up your act.