Tube lane manipulator for the high-pressure blowdown of heat exchangers having tubes being spaced apart by a given pitch forming tube lanes therebetween with tubes on opposite sides and having closeable servicing openings formed therein providing access to the tube lanes, comprising a car being insertible into the tube lanes through the servicing openings and being movable therein by remote control, a spraying head being supported on said car and having nozzles with orifices for spraying jets of blowdown water in a given direction into spaces between the tubes, suction lines having suction stubs for pumping off accumulated blowdown water, and extendible and retractible clamping feet disposed on said car for clamping said car to the tubes on at least one side of a tube lane along a clamping plane in conformity with the given tube pitch, said nozzles being positioned in spraying positions of a spraying position sequence by said clamping feet clamping said car, said given spraying direction from said orifices of said nozzles being adjusted to the given tube pitch and said nozzles being spaced from said clamping plane by a distance being adjusted to the given tube pitch for spraying the jets of water into the spaces between the tubes.