Performing duties requiring knowledge, skills and abilities, and personal characteristics such as the following: Knowledge of the methods, materials and equipment used and the safety precautions to be taken in performing custodial work, including the knowledge of and proper use of the custodial supplies (synthetic soaps, scouring powders, floor finishes, etc.) and the proper techniques in using them on various kinds of floors, walls, toilet-rooms, equipment, furniture and other building furnishings and equipment. Knowledge of the care of buildings and grounds, walks, lawns, shrubbery, etc. and knowledge of the operation and care in the use of hand tools and the knowledge of minor adjustment and repair of furniture and other building equipment, including plumbing, heating and electrical fixtures.