In their case, "out" means way, way out—hundreds of miles, to Earth's surface, where it can be washed the old-fashioned way. Since old-fashioned pickup and delivery are out of the question, though, this task is accomplished by the Space Shuttle, which on a few trips a year to the ISS carries a multi-purpose logistics module (MPLM) full of supplies (food, toiletries, clean clothes) and then returns with a payload of dirty laundry and other things that aren't…… More »