FountainCoins.com

Not quite as efficient as our process but the St. Francis Hotel has been doing this for a lot longer!
http://www.sfgate.com/bayarea/article/Coin-washer-keeps-Westin-St-Francis-change-shiny-2518445.php

Coin washer keeps Westin St. Francis' change shiny In a small, windowless room in the bowels of the Westin St. Francis hotel on Union Square, Rob Holsen washes the hotel's money. Since 1938, all the coins the St. Francis acquires through its cafe, restaurants and bars - all of it tarnished by the grime of the outside world - has made its way through...