Cleanliness (n.) is learning to come out of unclean situations cleaner — and if necessary washing yourself with dirty water.
Cleanliness (n.) among humans requires knowing how to wash yourself even with dirty water — and not dying of thirst means drinking from all glasses.
Cleanliness (n.) depends on the beholder — "to the clean all is clean," folks say — but to swine all becomes swine.
Cleanliness (n.) in a different sense and degree separates two people most profoundly: "They can't stand each other's smell!"
Cleanliness (n.) as an instinct smells the entrails of every soul, and the hidden dirt at the bottom of a character, glossed over by education, enters consciousness almost at the first contact.