Many car washes have a change machine that dispenses tokens to use in the boxes or with vacuum cleaners. This allows to accept payment methods without staff and a limited investment as the tokens can be used in any machine in the car wash.
Car wash is a wet environment, so a corrosion free material is required.
The customers are often recurring, so a custom made token is recommended rather than a generic standard token. This increases customer loyalty and reduces risk of receiving tokens from other companies.