Why does it feel so good to be clean?

I’ve been sick this weekend, and until about 10 minutes ago, I had not taken a shower since Thursday. After my shower I feel so much better then when I was dirty.

Aside from smell, which can be bothersome, what it is about being dirty that feels so disgusting? I can’t seem to put my finger on it. It’s not like I’m actually caked in dirt or visibly soiled.

Some people can go for a long time without a shower. Is it just conditioning or is there some biological/physical reason being clean feels soo good? Is it just in my mind?