It was really cold and wet that day - and my hiking boots are really messy when I return to the car. I make my slave lie down next to the car on the dirty cold ground wearing only a t-shirt - then I step on his chest and use him as a rug to clean my boots - I rub my muddy boots all over his chest and face, but they don't get clean enough! Then he has to lick the muddy dirty soles clean, get his tongue deep into the tread of the boot soles - until his tongue and teeth are black and my boot soles are clean!