Abstract: A cleaning device for cleaning a capsule based beverage system is described. The cleaning device includes a body portion having an open end and configured to be located in the brewing chamber of the beverage system and a reservoir portion located at an opposed end to the open end of the body portion as well as a fluid jet forming portion in fluid communication with reservoir region. The cleaning device also includes a cleaning material holding portion located internally of the body portion for holding the cleaning material spaced apart from the fluid jet forming portion. The cleaning device is configured to allow water under pressure originating from the inlet arrangement of the beverage system to flow into the reservoir portion and to form a fluid jet from the fluid jet forming portion that impinges on cleaning material held in the cleaning material holding portion to create a cleaning solution to clean the brewing chamber and outlet arrangement of the beverage system.