A conveyor-type dish washer and a method of operating it, characterised in that a final-rinse operation is executed with the consumption of final-rinse liquid of 3 l/m2 movement of the horizontal take-up plane of a dish carrier or less, preferably of 1 l/m2-2.5 l/m2, while the items (154, 156) which are to be finally rinsed are being subjected to final-rinse liquid spray jets; wherein said take-up plane is the horizontal area of the dish carrier where the dish carrier can take up items to be cleaned.