PURPOSE: To obtain a constant washing effect all the time regardless of running speeds by controlling the running speed of a washer body and the revolving number of a washing brush in an interlocking manner.

CONSTITUTION: Signals from each of various sensors are put in a micro computer 5 in which the input signals are processed and a speed command signal is sent out to the drive circuit 2 of a running motor 1 to control the running speed. The speed command signal is also put in the drive circuit 4 of the drive motor 3 of a washing brush which is controlled according to the running speed of the washer body. Also, according to the running speed of the washer body, even the supplying amounts of water, detergent and wax are controlled by the micro computer 5 and maximum washing effect can thus be obtained all the time.