Is it better to be dirty or clean for your immune system?

You want to wash your hands as much as possible. We breath in many different bacteria and viruses. The reason you wash your hands to rid of germs are they are typically the ones to harms us. The Cold's, Flu's, E-Coli, bacterium that can really bring you down. I am not saying that all the germs you breath in won't make you sick because some will. But with our human nature we are always rubbing our eye, scratching our nose and wiping our mouths with our hands which is why it is important to wash your hands multiple times a day with soap and water for at least 30 seconds, and in between using hand sanitizer in between. A germ that may not be harmful to me may put you down and out for a week!