Abstract: A semi-automatic cleaning system for removing debris from internal walls of a heat exchanger, or the like, having a plurality of tubes arranged in parallel with each other and ends of the tubes periodically spaced along a spacing line in a plane perpendicular to the tubes. A tool of the system is mounded along the spacing line and a fluid delivery device for providing a high-pressure fluid through each tube is moved from tube opening to tube opening in an automated manner following an initial setup procedure to determine a spacing distance. The spacing distance is revised with movement to each tube opening, so as to correct for any deviation from the nominal tube spacing. The system can include a cleaning device which is inserted into each tube, prior to providing the high-pressure fluid, to scrape and remove deposits, debris, and the like from the internal walls.