tubular casing 18 the shaft 66 has an area of a reduced diameter 68 being surrounded by an open helical compression spring 70 the upper end of the shaft 66 has an operating lever 72 projecting through a slotted opening 73 in casing 18 a perforated plate 74 is threadably attached to the lower end of the shaft 66 and a pinion gear 76 is affixed at the terminal end thereof the gear 76 is provided with a keyway 78 for accepting a stem portion 80 of a scraper blade 82 rotary movement of the scraper blade 82 is effectuated by means of the engagement of a toothed rack 84 with the teeth of the pinion gear 76 during manual reciprocal movement of an extension arm 86 the arm 86 projects externally from receptable 12 and is pivotally secured to the perforated plate 74 by a pin connection 88 and additionally is provided with a wire spring 90 for returning the extension arm 86 to its initial position it should be apparent that the compression spring 70 will normally urge the scraper blade 82 and gear components to a storage position clear of the waste collection bag 22 when not being used this position is illustrated in solid lines in fig4 after the waste collection bag 22 has been removed cleaning is effectuated by applying pressure to operating lever 72 against the force of spring 70 the blade.