Question

I was thinking about this during work today. Is a bar of soap ever dirty? Like. If it drops on the ground, would it be dirty? Or is it a complete clean entity that spreads its cleanliness to everything it touches? So say, would sharing a bar of soap be unhygienic? This really boggles my mind, my brain got really exhausted after thinking about it for like a whole hour. I mean a bar of soap is just a chunk of clean-stuff. and we use this to clean ourselves. when somebody wipes their ass with the soap, does the dirtiness get immediately neutralized once it touches the surface of the soap? Do i need to wash the soap? And with what do I wash it with? With soap? Is it possible to wash soap with soap?
I need an answer on this.

Ooh, I finished really Lone Wolf and Cub Volume One today.