The invention relates to a compressed‑gas motor for operating a wash system, comprising a cylindrical inner chamber which is closed gas‑tight at at least a first base surface, at least one piston which is arranged so as to be movable along the cylinder axis in the cylindrical inner chamber and which closes tightly with the inner chamber, a piston rod which is connected to the piston and which projects beyond the second base surface and out of the inner chamber, a first opening for feeding a compressed gas into the inner chamber, and a second opening for discharging a gas from inside the inner chamber, wherein the openings are arranged in the cylinder casing of the cylindrical inner chamber, wherein the first opening is arranged between the second opening and the closed first base surface, and the piston comprises a first piston part and a second piston part which are interconnected, wherein the first piston part comprises at least one passage and/or forms at least one passage between the first piston part and the cylinder wall of the inner chamber, and the second piston part tightly closes the inside of the inner chamber, wherein at least one passage in the first piston part connects an intermediate chamber between the first and the second piston parts to an inner chamber region between the closed first base surface and the first piston part, and wherein the first opening can be closed by the first piston part and the second opening by the second piston part, and the compressed‑gas motor comprises a resetting device which exerts, at least intermittently, a force on the piston in the direction of the first base surface of the cylindrical inner chamber if the second piston part does not completely close the second opening. The invention also relates to a handle for a wash system comprising such a compressed‑gas motor, a wash system comprising such a compressed‑gas motor, and a method for operating such a compressed‑gas motor.
