Dara Birnbaum, PM Magazine,1982, four-channel video, chromogenic prints - Monitoring during exhibition; surface cleaning and dusting before deinstallation. / © images MoMA

Surface cleaning of the recto was carried out in three steps. First the most superficial dust was blown up away with air blower; then a soft brush was used to gently brush away the dust. As final step, a microfiber cloth was used to remove the finest particles of dust still present on the surface. © images MoMA

Detail of the surface before treatment. /  © images MoMA

 Detail of the surface during treatment. / © images MoMA