The Mir Space Station
> By the time the station was finally abandoned in 2000, its degeneration into a disgusting orbital stinkbomb had become an open secret. In one particularly egregious incident in 1998, American astronauts discovered that dirty water globules—some of which were roughly the size of basketballs—were casually free-floating behind some of the station’s service panels. These gross liquid orbs, which were alternately brownish or cloudy white in color, had become miniature planets of activity for the opportunistic microbes that were attempting to commandeer Mir.<p>So, how does the ISS compare on the hygiene front?  They did show some mold, but didn't really talk about it.  If it's cleaner, what did the ISS do right and Mir do wrong?