A treatment system (1) for cleaning a component part contaminated with a biofilm, in particular for cleaning bacterially contaminated surfaces of bone implants or dental implants (20), shall enable a particularly effective, locally focused and flexible treatment. For this purpose, the treatment system (1) according to the invention has a conduction element (10), which can be put into electric contact with the component needing treatment and which can be connected to a first pole of an electric supply unit (16), and a media cannula (2) which is provided for supplying a treatment liquid and whose interior is connected in an electrically conductive manner with the second pole of the electric supply unit (16).