Rinsing your hands with water is not enough. According to specifications released from the Board of Health, the proper way to wash your hands is with warm water and soap from a liquid dispenser. Then, you must scrub you hands and nails for at least 30 seconds. Do not dry your hands on your clothes. Think about how many people you brushed up against and how many walls and doors you leaned on.
Germs are everywhere.
In addition, if you can, on the way out of the restroom, use a paper towel to open the door. The last person might not have washed their hands. Constant hand-washing may dry out your hands, but regular use of hand lotion will prevent this from hapenning. If you're not near a sink during the day, carry a bottle of anti-bacterial hand gel. Although the gel kills germs, it is not a substitute for washing your hands.