Abstract: A control system for vehicle wash bays, including one or more controllers, control lines to plural wash bays, and one or more communication links to a common communication hub (e.g., an Ethernet hub) for said controllers. The controllers communicate with plural pay stations for the plural wash bays over the communication links using the common communication hub, and the controllers control the plural wash bays using the control lines responsive to communication with the pay stations. In some embodiments, a computer also communicates with the controllers and with the pay stations over the communication links using the common communication hub.