Abstract: An apparatus for cleaning a continuous, long, linear object in a solvent medium includes an inlet ramp and an outlet ramp for the object, and a tubular guide open at its ends for guiding the long, linear object. The object moves inside the tubular guide along an imposed trajectory in the form of a continuous curve. The tubular guide is provided, adjacent one end, with an inlet for clean solvent medium and, adjacent the other end, an outlet for dirty solvent medium. The solvent medium circulates through the tubular guide in contact with the long, linear object in the opposite direction to the direction of movement of the object through the tubular guide. A device for subjecting the solvent medium to ultrasound is also included. The apparatus is particularly intended to be used for cleaning filiform objects, objects in the form of a strip or objects consisting of unit elements joined together to form a strip.