@Arnold
I will certainly steam on the machine one or the other time. In future, however, only with a gas burner. This minimizes the pollution of the boiler and burner house and the effort involved in cleaning considerably.
@Jan
You noticed correctly about the repainting. Unfortunately, the dirt on the machine base could not be removed to my satisfaction. So I decided to repaint the machine base as well as the burner house and the chimneystand.
Thank you for your appreciation!