Machine for Cleaning Knobs That Is Good for Parts Replacement parts and accessories for semi-automated washing machines, dryers, and drain timers Universal Washing Machine Switch Knob All Washing Machine Accessories and Semi-Automated Washing Machine Knob Replacement Drain Spin Timer Switch Knob and Spare Parts This set of four universal washing machine knobs is ideal for cleaning machine parts, accessories, and spare parts as well as dryer and drain timer switch knobs. Replacement parts and accessories for a semi-automated washing machine, including a set of four dryer and drain timer switch knobs washing machine replacement knobs are typically round control dials made of durable plastic, designed for use with semi-automatic models.