This RT card provides guidelines on the cleaning and maintenance of hygienic indoor spaces. It is aimed particularly at service purchasers who are responsible for cleaning and maintenance. This RT card also provides information for providers of cleaning and maintenance services, and users of hygienic indoor spaces. This RT card is part of the Hygiene in indoor spaces instructional series. The other parts of the series are General principles and Spatial planning. This RT card was made for the conditions of Finland.