re: Water dump and cleaning
Sorry, but living in Florida, I'm not a fan of water dumps. The Florida Keys has strict regulations on it, but I know, that's a different animal in a different kind of void.
Anyways, ISS and shuttle windows may not be big fans of those tiny frozen droplets and everything else they encounter.
Finally, they'll have to come up with a way to clean space windows and camera lenses with some type of waterless cleaners. Atlantis hasn't been up as long as the ISS and their windows already need cleaning. LOL I know they'll get a thorough cleaning once they land.