A method for cleaning the interior of a freight container of ISO type having an access opening for receiving goods, wherein the method comprises: providing a cleaning tool comprising a framework, a robot movably connected to the framework and having a nozzle for supplying a cleaning medium including dry ice, and an actuating unit arranged to move the robot relative to the framework; gripping the framework of the tool with a truck designed for gripping and carrying freight containers of ISO type; driving the truck carrying the tool to the container to be cleaned; moving the robot into an interior of the container by means of the actuating unit; and moving the nozzle by means of the robot along a programmed cleaning path while cleaning the interior of the container by means of dry ice blasting.