Rapunzel, Rapunzel, let down your hair

I was always captivated by fairy tales. Rapunzel amazed me because here was this girl whose hair grew astronomically long. So long that an old woman was able to use it as a ladder to climb in and out of a tower. Thinking about it, how was a girl with hair 20 feet long to keep it clean if she were locked away in a tower that probably had no running water? My hair is barely past my chin and I still manage to get things stuck in it (and thats without someone climbing up and down in it).