These small, often metallic, discs represent a pre-paid form of currency specifically for automated vehicle cleaning services. Typically purchased in bulk or as part of a service package, they are inserted into a machine to activate the wash cycle. An example would be a user acquiring a set of these prior to visiting a self-service car wash bay, using one disc per wash selection.
The importance of this payment method lies in its efficiency and operational advantages for car wash businesses. They simplify transactions, reduce reliance on cash handling, and can encourage customer loyalty through bulk purchase discounts. Historically, their use stems from a need for a standardized payment system compatible with automated equipment, predating widespread digital payment solutions.
