It   is   a    periodic cleaning and maintenance of areas which are outside the scope of daily cleaning routine due   to inaccessibility  or  need   to  use   specialised  personnel,   equipment   and chemicals.  This  involves   the  regular  descaling    and   disinfecting   of   all sanitary   fittings  and  associated pipework e.g. clearance of pipe  blockages and maintenance of cisterns and  taps  in  the  washrooms.  The aim is to minimise the health risk to users of the facilities and to provide conditions that are pleasant to use.