A museum professional has been working on an extended amount of hours to remove dirt and grease that a vandal left on a painting this professional curator or conservationist historian or archaeologists
could be a curator or a conservationist. A curator is responsible for the overall management and preservation of a museum's collections, including overseeing conservation efforts. They may work closely with conservationists, who specialize in the preservation and restoration of artworks, artifacts, and historical documents.
Additionally, a historian or archaeologist might be involved in the process depending on the significance and historical context of the painting. Historians would provide valuable insights into the artwork's background and its importance within the broader historical context, while archaeologists might analyze the materials and techniques used in its creation.
However, it is important to note that the specific roles and responsibilities within a museum can vary depending on the institution and its staff structure. Therefore, other professionals like art restorers, conservators, or even technicians could also be involved in the cleaning process alongside or instead of the aforementioned roles.