These Public Spaces Do Get Cleaned, But How Often (Or Little) They Do Will Make You Disgusted

It can be easy to ignore just how dirty public spaces are. We like to imagine that when we go out to eat, the people handling our food washed their hands. We want to believe that airlines actually clean out the waste tanks on a regular basis. But every once in a while, one can't help but wonder: just how often are public spaces cleaned? Are public bathrooms cleaned? Are public trains and buses cleaned? 

Unfortunately, the answer to these questions is often no. Public spaces can go days, weeks, months, or even years, without ever being properly cleaned. What are some of the dirtiest public spaces? How about the cleanest? How many germs are you being exposed to be simply existing in the world? The answers to these questions may surprise you - and totally gross you out.