ATTENTION: Only for use in participating Commercial Laundries locations. National Wash Laundry Pay is an iPhone application providing the easiest and smartest complete laundry solution. This app allows you to pay for laundry cycles from your account by using Bluetooth to communicate with the washer or dryer. Simply use National Wash Laundry Pay to purchase credit right from the app, then use that credit for your laundry. A full accounting is available to see your transaction purchase history.