There are different types of self-serve car washes available, with the most basic being where customers can select cleaning functions and use the system themselves using timers to control water and soap. These systems often use conveyor belts to move vehicles through distinct cleaning stages like rinsing, soaping, and drying. Rollover systems located next to gas stations also use electronic equipment to spray water. The most expensive option is a full-service wash that uses both electronic and manual cleaning systems.