Stan Atkins, group chief executive officer of British Institute of Cleaning Science reports
As being clean is a perception, sometimes when we visually check a surface for dirt and dust and it is bright and shiny we immediately perceive it is clean – this is not always enough. This surface, although clean to the eye, could have many micro-organisms or other invisible contamination that makes it unsuitable for its purpose. In this column I will be discussing the three most commonly used methods of measuring or identifying the presence of contamination.