Patent ID: 7387688

Claim:
A method of cleaning dishes in a dishwasher in accordance with a programmed wash cycle implemented by a central control unit and comprising a rinse step and a cleaning step where a rinsing liquid is recirculated in the dishwasher, the dishwasher comprising an upper spraying apparatus defining an upper spray plane and a lower spraying apparatus defining a lower spray plane, the method comprising: determining turbidity values corresponding to the recirculation of the rinsing liquid in the lower spray plane and the upper spray plane, respectively, the lower and upper spray planes alternately recirculating the rinsing liquid and the determined turbidity values being associated with the respective spray plane in operation; determining a degree of soiling by determining a difference value corresponding to the difference between the turbidity values of the upper and lower spray planes; and setting at least one operating parameter of at least one of the rinse step and the cleaning step based on the determined degree of soiling.