screw joint bolt joint rivet joint welding and or brazing u2014 mounted on a connecting rod 9 from fig6 and 7 is evident how the connecting rod 9 in turn is connected to a drive mechanism 10 which enables automatic operation of the cleaning device in a way decided beforehand the drive mechanism 10 is of a previously known type here a suitable method of using the cleaning device according to the invention in cleaning an outlet port 11 with the appurtenant subjacent outlet spout 12 in connection with a soda recovery boiler 13 will now be accounted for more closely and in connection with the fig8 a c first the drive mechanism 10 is brought to direct the cleaning device against an outlet port 11 that is to be cleaned and in that connection locate the front end of the first cleaning part 1 a right opposite said outlet port 11 see fig8 a wherein it should be observed that in the respective fig8 a c for the sake of clarity only the front tool part 1 a d 3 6 and the rear tool part 2 a d of the cleaning device have been drawn in which parts together constitute said cleaning tool then the drive mechanism 10 is brought to insert the first.