I always have dirty feet, even after I shower. It's probably because I spend a lot of time barefoot, especially when in grass and dirt and now I just have a layer of perma-dirt on the bottom of my feet along with some useful calluses ha. I know I've had a good day I come home and my feet are nice and dirty. Some people really don't like feet, and I don't entirely understand why. I find them fantastically useful.