Book excerpt: The starting point for this project is a huge database of images made by cleaning companies that were hired between 2005 and 2010 by the Municipality of Eindhoven. The cleaning companies were instructed to remove municipal property in the public space from graffiti and stickers. As proof of work they made 2 photos of each job, one for cleaning and one after. During the 6 years that this work was done, 50,000 photographs were taken and saved.