In a small, windowless room in the bowels of the Westin St. Francis hotel on Union Square, Rob Holsen washes the hotel's money. Every penny, nickel, dime and quarter. Three times a week, Holsen soaps, rinses, dries and rolls money. He estimates that $1.5 million in spare change has passed through his hands in the past 20 years. "That's a lot of pieces of money," Holsen said as he began a recent cleaning. Since 1938, all the coins the St. Francis acquires through its cafe, restaurants and bars - tarnished by the grime of the outside world - have made...