You are filthy.
Yes, you.
So am I and every other person on the planet.
We're all animals. We live in filth that, for the most part, we cannot see. We are permanently covered in layers of dirt, grime and cellular waste (re: dead 'us' bits) that we slough off constantly. We bathe and wash and re-bathe and re-wash ourselves, but no matter how much of that we do, we're still covered in organic gunk. A whole lot of it is beyond normal eyesight, but we're covered in everything from bugs to dirt to germs and viruses. Not only on our surface; we're chock full of delightful little living thingys. Lots of them do us good, but some are on the bad side. Regardless, we're hosts to countless numbers of organisms and we're covered in filth.
I generally don't care. I know this stuff is on us all, it doesn't bother me. Most people are reasonably clean and take care of themselves, so that the levels of dirt and detritus are not blatantly obvious to the eyes (and also to the nose). Unfortunately, some people are not clean at all. Yuck.
The point of this: I get to fix computers on a daily basis. If your computer is covered in organic matter of ANY nature, clean it off before you bring it to me. If it happens to be covered in anything that came from you, I do not want it.
It's called a cloth and spray on disinfectant cleaner. Investigate it further...
(PS. Not pointing fingers at anyone I know personally, it's just general humorous disgust at some of the things I see at work... blech! *smile*)