>>42789559
>I'd be surprised if any of them got washed
They apparently all share the same hot water supply according to Party of One.
>Manehattan on the other hoof
Oh absolutely, the main questions are how developed a given town is. Cloudsdale is constantly sucking up water to help with producing clouds for the whole of Equestria so you'd assume that's being used for their personal needs as well. Other cloud cities likely just suck up a lake once every few days, use it for all their needs and then dump it back where it was before.