Abstract: A method is described for cleaning the surface of extended bodies, such as pipelines, of contaminating materials, and it is characterised by the following features: that an apparatus (20) is arranged to surround and seal around the body (10) so that a completely closed or partially closed cleaning chamber is defined between the inside of the apparatus and the outside (12) of the body (10), that a number of spraying bodies arranged in connection with the apparatus is brought to spray the surface (12) with a pressure fluid containing an abrasive agent to loosen contaminating materials, that the mixture of contaminating materials and spent abrasive agent is led away via a suction section, in a closed way for further processing, that means are used to move the apparatus (20) along the pipe surface (12), and that the abrasive agent possibly is separated and used again. An apparatus (20), a frame construction and also a pipe construction for distribution of particles are also described.