Cleaning device of an exhaust gas turbine

The gas inlet housing has a tubular outer housing wall (10) with a circular outlet opening, and a dome-shaped inner housing wall (12) with a circular ground surface outer contour. The inner housing wall is arranged within the outer housing wall. The flow channel has an elliptical cross section with a short axis of symmetry and a long axis of symmetry in the area of a cleaning nozzle (7). The cleaning nozzle is extended along the short axis of symmetry of the elliptical channel cross section.