Abstract: A device for cleaning the heat-exchanging surface of a storage medium of a regenerative heat exchanger which has a rotatably driven hood. The device utilizes rinsing or cleaning fluid which is discharged from at least one spray nozzle essentially parallel to the planes of the heat-exchanging surfaces. The spray nozzles are movable relative to the storage medium. In order to provide a structurally simple, light-weight cleaning device which can be housed in a space-saving manner, the spray nozzle is disposed at the end of an at least two-part, telescopic nozzle holder which is mounted on the hood of the regenerative heat exchanger and is connected by a supply line with a transfer mechanism disposed in the center of rotation of the hood. The transfer mechanism includes a tubular piece which rotates with the hood, and a stationary housing which is sealed off relative to the tubular piece. The adjustment movement of the movable part of the nozzle holder can be derived from the rotational movement of the hood.