Abstract: A simple and effective process allowing the cleaning of the part to be stopped at the required moment.It consists in:placing the part inside a tank,introducing a solvent into the tank, until the part to be treated is totally submerged,subjecting the submerged part to low-frequency ultrasounds, for long enough to remove the soiling matter, thenremoving the cleaned part.Application for cleaning rotors and stators of dynamoelectric machines.