Soiled waste disposal areas in municipal public housing buildings are not only a major nuisance for residents, but also cause high cleaning costs. The aim of the present study was to develop behavioral measures to promote cleanliness and to test them in a field experiment with about 400 waste disposal areas. The present paper compares two System-1 (large posters displaying watching eyes and a natural landscape) and two System-2 (financial information, information on normative behavior and consequences) approaches to prevent littering. A pre-registered field experiment in which naturally occurring littering behavior in waste disposal areas was conducted. The experiment set-up not only accounted for baseline cleanness and short- and medium-term effects but also measured effects of the infrastructure. The results show that waste disposal areas are in general quite clean. Those outside are cleaner than those within buildings and full waste containers as well as the size of the building correlate negatively with cleanness. The results further indicate that system 1 measures (eyes, nature) work better than system 2 measures (money, pictograms).