37 Technical maintenance of buildings and business centres; maintenance of air conditioning and climatisation apparatus, maintenance of lifts and escalators, maintenance of boilers and heating apparatus, maintenance of electrical installations in buildings, maintenance of automatic vending machines for food and drink, maintenance of fire alarms, maintenance of fire-extinguishing apparatus, maintenance of burglar alarms, maintenance of security systems, maintenance of computer and telecommunications networks, maintenance of telecommunications apparatus and computer hardware, telephone maintenance, maintenance of facsimile machines, repair of locks; maintenance and cleaning of buildings; window cleaning; cleaning of buildings (exterior surfaces); disinfection, rat extermination; vermin extermination except for agriculture purposes; vehicle maintenance; cleaning vehicles; washing vehicles; washing linen; ironing linen; laundering linen; laundry services; shoe repair; mending clothing