Here’s a very helpful- and somewhat scary- infographic (that there is a fancy word for picture) from Keeping It Kleen.
My big germ thing is shoes. It completely boggles my mind that most people (us included) walk around inside their houses with their shoes on. The same shoes that walk in all kinds of who knows what day after day. There is a tree in front of our house. Lots of birds congregate there. There is always a big pile of bird poop on the sidewalk. People walk across that sidewalk on their way to our door.
If I could go back in time, I would ban shoes in my house. I’m not kidding.