Abstract: An apparatus for cleaning a printing machine cylinder or the like by pressing a cleaning cloth against the outer periphery of the cylinder or the like is disclosed. The apparatus includes a cloth unit assembly including a cloth cassette and a cloth unit. The cleaning cloth is accommodated in the cloth cassette, and the cloth unit has a space for accommodating the cloth cassette. The cloth unit is provided with pressurizing means for pressing the cleaning cloth fed from the cloth cassette against the cylinder or the like. The cloth cassette has an engagement projection specifying the kind of the cylinder to be cleaned, while the cloth unit has an engagement projection matched to the engagement recess of the cloth cassette.