A floor buffer attachment and bare floor dusting pad were introduced with the Model 2C, along with a hand-held, paint spray gun and upholstery shampoo dispenser called the Suds-O-Gun, powered by attaching the hose to the turbine discharge tube have remained. A carpet shampoo attachment, called the Rug Renovator appeared with the Dual Sanitronic 50 in 1965, which uses a dry foam method to scrub the shampoo into the carpet. With the introduction of the Avalir, the Rug Renovator was modified to function as a floor scrubber, cleaning hard floors, scrubbing tile and grout, or polishing hard surfaces, using specialized brushes for each task. One of its earliest available tasks is being able to vacuum mattresses, couches and carpeted stairs by replacing the elongated handle and converting the machine to a portable, hand-held cleaner while still using the carpet nozzle. With the introduction of the Classic in 1970, an unusual feature was installed in the handle; a small object depository integrated into the back of the handle called the "Kirby bank", a place to store any coins, paperclips or other small metallic items that could damage the turbine fan if sucked up. The plastic backing of the handle could be easily removed and items placed inside could be retrieved. Oddly, this feature was never mentioned in the owner's manual from 1970 until it was discontinued in 2006.