The invention relates to a treatment liquid designed specifically to be suitable for cleaning bacterially contaminated surfaces of bone implants, dental implants or other components that are contaminated with a biofilm. The treatment liquid according to the invention comprises as one if its main constituents an aqueous solution of an acid, which is provided with a metal salt in such a way that a conductivity of at least 30 mS/cm, preferably at least 75 mS/cm and especially preferably at least 150 mS/cm is achieved.
