car wash business. Car washes can be self-serve, fully automated, or full-service with attendants who wash the vehicle. Among the many advantages to owning a car wash, one of the most attractive to new business owners is the amount of profit one can generate. most car washes see 30-50% of their customer base purchasing the basic wash only, and a profit margin of a mere quarter for 30-50% of all washes is just not enough. want to know more about car wash business contact us today.