| 摘要 |
PROBLEM TO BE SOLVED: To control the concentration of a liquid agent such as a detergent and to eliminate pressure loss and pipe line clogging by a method in which the spray pressure of cleaning water is made variable, the liquid agent is mixed into the cleaning water, the discharge of the agent is controlled, and the outflow of the agent is controlled corresponding to the spray pressure of the cleaning liquid. SOLUTION: A main body apparatus 1 is equipped with a water tank 4, a detergent tank 5, a wax tank 6, a hot water apparatus 7, a pump 8, and piping 9, When the operation part 13 of each car washing terminal 2 is operated at present, first the pump 8 is driven, and cleaning water in the tank 4 is ejected at a high pressure. Next, a solenoid valve 12c is opened, part of the cleaning water to be ejected from the pump 8 is returned, and change-over to low pressure ejection is done. Next, another solenoid valve 12b is opened, and the cleaning water is mixed with a detergent and ejected from a spray nozzle 15. After that, each of other solenoid valves 12c, 12d is opened, wax water is ejected. At the end, restoration to a cleaning water ejection state is done, and the remaining of a wax component is prevented.
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