An apparatus and method for ultrasonic pre-cleaning cleaning of objects such as medical or surgical devices optionally having a lumen are described of a tank for holding cleaning liquid, the tank having at least one first wall and a bottom and being adapted to hold cleaning liquid and to expose the cleaning liquid to ultrasound a weir opposite and parallel to the first wall and a first channel adjacent and proximal to the weir and distal with respect to the tank a first drain located in said first channel for draining cleaning liquid that spills over the weir a second channel in the form of a depression in the bottom of the tank, and a second drain located in the second channel for draining cleaning liquid from the tank.
