Or, rather than trying to keep your hands sterile which is a futile exercise, doing what the military teaches - keep your hands away from your face (eyes, nose, mouth) and don't scratch your skin.
The reason you care about germs on your hands is because they make you sick when you stick them in your body orifaces. Otherwise, those germs don't matter.
Related rant: The widespread stupidity around bathroom doors calls the intelligence of humans into (even more) question.
Airplane-bathroom doors open out because they must. But the number of public-bathroom doors that inexplicably open INWARD is mind-boggling. Instead of simply having doors open outward, millions of bathrooms create mountains of paper waste by having them open inward and encouraging users to waste a paper towel to grab its handle.
The reason that interior doors in general open inwards is fire safety. Doors that only open outwards can be obstructed from the outside, preventing evacuation.