No matter how many times you wash a goat, it will still smell like a goat.
What it means
Washing works on the outside. Get a goat clean and for a while it looks like a different animal. But the smell was never dirt. It comes from the goat itself, so it returns as soon as the water dries.
The proverb lives in that gap — between what washing can reach and what it cannot.
It is usually said about people and their character. Anyone can change how they present themselves: better clothes, better manners, the right words in the right rooms. None of that touches what a person is actually like. Give it time, or pressure, and the nature underneath shows again.
Another proverb in this archive makes the same point more gently: a cat may go to a monastery, but she still remains a cat.
