To wash a material to be washed with a small quantity of water.

There are provided a vessel for storing washing water for washing vehicles and small-sized ships, a pump for drawing the washing water from the vessel, a sponge 11 containing the washing water from the pump, a liquid jetting part 20 installed in the sponge 11 for jetting the washing water. The liquid jetting part 2 is provided with jetting ports 21A, 21B fitted toward the inside of the sponge 11, and the washing water from the jetting port 21A is fed to the sponge 11.