Guys remember that there is more bacteria in the world than insects and creatures in the sea…People spit, urinate on the floor/soil insects spit, urinate, and stool on the floor/soil, birds which must be in the trillions in numbers spit, stool and urinate on the floor/soil, pets and animals all over spit, stool and urinate on the floor/soil, something else that people are not aware of is that on the floor/soil lands I think lots of cosmic dust from outer space [who knows what drops from outer space], there is polen, people throw who know what on the floor, again a lot of stuffs that lands on the floor/soil…Is not a problem now but you will have to wash and scrub with soap/detergent the entire land mass in the future, because is going to get so contaminated, maybe in a couple of hundreds of thousands of years or millions of years…And remember that your feet are like your hands too…

So maybe not now but in the distant future, any billionaire or country wants to send to wash and scrub the entire Earth land mass is more than welcome to do so…