Requirements: Knowledge of methods, materials and equipment used and the safety precautions to be taken in performing custodial or janitorial work, including: Proper use of custodial supplies (synthetic detergents, soaps, scouring powders, waxes, etc.) and the proper techniques in using them on various kinds of floors, walls, toilet-room equipment, furniture and other building furnishings and equipment. Operation and care of custodial equipment (vacuum cleaners, floor machines, floor brushes, sweeping mops, etc.) and low-pressure heating systems and ventilating equipment low-pressure heating systems and ventilating equipment.