UDC™ ULTIMATE DRAINING COMBO UDC™ ULTIMATE DRAINING COMBO Draining better. The Ultimate Draining Combo ensures high drying performances on all surfaces thanks to the perfect technological mix between standard three-stage suction motor, V squeegee assembly and a combination of blades in different materials. Applied to: CT46 Benefits Long lasting drying effectiveness. Fitting on different floor types. Longer life of consumables (blades).