81.220Level 581.22Other building and industrial cleaning activities81.22001Interior cleaning of buildings of all types: offices, factories, workshops, premises of institutions and other premises for commercial or professional use, apartment buildings, etc.81.22002Window cleaning 81.22003Chimney sweeping and cleaning of hearths, furnaces, boiler incinerators, ventilation ducts and smoke evacuation devices81.22011Steam cleaning, sand blasting and similar activities for building exteriors