Abstract: A pair of parallel rollers disposed in a path of advance of leno waste exiting from a leno weave portion of a weaving machine are provided with facilities for maintaining their peripheries free of the leno waste as such waste advances through the roller nip. Each of the rollers is made hollow, and is provided with a plurality of peripheral apertures for continually ejecting pressurized air axially introduced into the hollow interior of the cylinder by a fitting in its end wall. Each of the so-apertured cylinders is disposed within a contoured housing which necks down in the leno waste-advancing direction from a relatively wide, convex central portion to relatively narrow inlet and outlet end portions through which the waste enters and exits from the roller nip. As a result, pressurized air emerging from the peripheral apertures of the rollers is directed radially outward through each of the narrow end ports of the housing to entrain the leno waste and to continuously clean the periphery of the cylinders.