Abstract: A treatment container for washing and rinsing materials includes a body with open top and a screen or mesh in proximity of the top of the body for allowing drainage of excess cleansing liquid and washed-off substances during cleansing of the material while retaining the material within the interior of the container. For complete removal of water and washed-off substances from the container after terminating washing of the material, the container may be closed by a lid and turned upside down to thereby permit the cleansing liquid to drain through the mesh which, at inverted position of the container, extends at the bottom of the body.