All places of employment must be kept clean and orderly, with surfaces kept dry when possible, to prevent slipping, tripping, or falling hazards. Debris, waste materials, and scrap must be removed promptly and properly disposed of according to applicable regulations. Walkways and passageways must be kept clear of obstacles and maintained in safe condition. Storage areas must be organized so materials do not create hazards that could result in injury or property damage. Tools, equipment, and materials must be properly stored when not in use, and sharp objects must be stored safely to prevent cuts and punctures. Spills of oil, grease, water, or other liquids must be cleaned up immediately or covered with absorbent materials to prevent slip hazards. During winter conditions, ice and snow must be removed from walkways, ladders, and scaffolding to maintain safe passage. Smoking materials must be properly controlled and disposed of in appropriate receptacles. Waste disposal systems must be used for all trash and refuse to prevent accumulation on the work site. The frequency and methods for housekeeping must be sufficient to maintain safe conditions throughout all work areas and must be monitored by supervisors. Poor housekeeping practices can lead to multiple citations and have been identified in numerous workplace incidents and injuries.