To wash a bathtub at a small electric bill.

One or plural cylindrical boxes A are mounted on a disclike float E and fastened to the wall surfaces of holes by pins B and a motor F and a cushion J therearound are mounted within each box A. A hole is bored in a position slightly away from the center of gravity of a wheel P and the shaft H of the motor F is inserted into the wheel P and a ball bearing M. The motor F is rotated at high speed to cause the box A to vibrate at low frequencies to create fine waves from this vibration to thereby wash a bathtub. Also, a motor G and a pump K are mounted within a box C and linked to each other by the shaft H and the cushion J is mounted around the motor G and the pump K. The motor G is rotated at high speed to turn a fan L to draw in bathtub water through a suction port Q to eject a jet of water from a nozzle D to thereby wash the bathtub.