Method for carrying out a cleaning process in a tank container

A method for time control of an automated cleaning process in a tank container, wherein during the cleaning process cleaning liquid is sprayed onto the inner wall of the tank container by means of a spray head, comprising the following process steps:

• a. detecting the heat removal of a heating element disposed in the flow-off area of the cleaning liquid;
• b. continuously determining the state value of the cleaning liquid with regard to the two variables degree of contamination and spray rate by means of the heat removal;
• c. comparing the state value of the cleaning liquid in a quasi-stationary state with a target state value, wherein the target state value has been derived in an initialization cleaning process in which the inner wall was uncontaminated and the discharge rate of the cleaning liquid (5) from the spray head (2) comprises a target rate;
• d. terminating the cleaning process when the actual state value differs by less than a default value from the target state value.