Knobs, Handles, & Levers
Did you ever do cultures of microorganisms in school? No? Then learning how insanely gross doorknobs and handrails and buttons can be might send a shiver down your spine. Anything communal, such as the rail on an escalator or the buttons in the elevator or even the hand strap on the bus are rarely sanitized and are covered with dirt, germs, and even fecal matter.
Even the doorknobs around your home are not as clean as you might think. That is why you should always refrain from touching your face while you are running errands and must wash your hands upon returning home. Carry hand sanitizer with you to cleanse your hands after opening doors or using the public restroom.