В Средневековье для очистки кольчуг их помещали в бочки с песком и отправляли катиться с холмов, например. Пруфы: * http://www.celticwebmerchant.co.uk/en/tools-and-support/maintenance-and-tools/maintenance-and-care-of-armour-and-chainmail/ * http://www.alleycatscratch.com/lotr/Armor/Maille/Tips.htm * http://www.dagorhir.com/forums/index.php?topic=19747.0 * http://www.myarmoury.com/talk/viewtopic.php?t=5459&highlight=clean+mail Ищите слово «sand». А поинтересоваться я этим решил из-за следующего пассажа из «A Clash of Kings» Мартина: > He had been rolling a barrel of sand across the uneven stone, and was red-faced from exertion. Arya went to help him. Together they pushed the barrel all the way to the wall and back again, then stood it upright. She could hear the sand shifting around inside as Elmar pried open the lid and pulled out a chainmail hauberk. “Do you think it’s clean enough?” As Roose Bolton’s squire, it was his task to keep his mail shiny bright. > “You need to shake out the sand. There’s still spots of rust. See?” She pointed. “You’d best do it again.”