Cleaning of building exterior surfaces; Cleaning of building interior surfaces; Cleaning of building glass facades; Provision of information relating to building cleaning; Cleaning of external surfaces of buildings; Cleaning of buildings; Cleaning of building interior surfaces for reducing the spread of viruses and microorganisms; Cleaning of exterior surfaces of buildings; Cleaning of exterior surfaces of buildings and providing information relating thereto; Cleaning of office buildings and commercial premises; Cleaning of exterior surfaces of buildings and provision of information relating thereto