Abstract: Apparatus for processing plates for waterless lithographic printing comprises a first and second pair of driving rollers and washing tray in a first zone, a third and fourth pair of driving rollers and reciprocating brushing roller in a second zone, a fifth and sixth pair of driving rollers and a finishing roller in a third zone, and a seventh pair of rollers serving as an exit-drive means; a plurality of tanks is provided for holding treating solutions, with pump means for applying the solutions to the plate in the respective zones. The reciprocating brush is constructed to have a minimum mass, to impart as little vibration to the apparatus as possible.