Conveyor-type dishwasher with a plurality of treatment zones

The invention relates to a cleaning device (110), in particular a conveyor-type dishwasher (112) having a plurality of treatment zones (136) for cleaning stock (116). The treatment zones (136) are each a tank (144, 150, 160) is associated. One of the treatment zones (136) includes an operable in the bypass dirt separator (182). This leads purified flushing fluid, if required, at least one of in the transport direction (120) of the cleaning stock (160), viewed downstream treatment zones (136) again.