I believe the 46605 painting needs to be cleaned. I did some checking on how to do that.
Cleaning artwork is possible with a dry dusting brush to gently remove surface dirt, a damp sponge with a little soap and a Q-tip dipped in a gentle cleaner. Professionals typically use solvents like mild soap and water or specialized cleaning solutions for paintings.
Consider taking the painting to the dry cleaners. Have them dry clean the painting just the front side. Would the wax medium react to the dry cleaning chemicals? What about Dammar Varnish? It is water soluble. Take the risk of ruining it and get it dry cleaned.
If not dry cleaned, it could be cleaned with mild plain soapy water and a soft brush. Draw up water with a wet-vac brush attachment. Use an abundance of water.
Ask a professional about technologies in cleaning Art.
Comment: March 3, 2026; There are casts on the painting. That is the reason I think the painting needs to be cleaned. Since there are casts on the painting, use a dark light to illuminate and identify those stains.

UC Santa Cruz students head to class this week along Porter-Kresge Road as Kresge College is rebuilt behind them. The college was founded in the early 1970s and according to a press release from UCSC, was designed with “concepts of collaboration and participatory democracy at the core of its identity.” Kresge is being rebuilt in a two-phase project and the first phase, which included three new residence halls and a new academic center, has already been completed. The second phase is expected to be completed late this year. Kresge was the sixth college established at UCSC and was named after Kresge Foundation and K-Mart founder Sebastian Kresge. San Francisco-based architecture firm Studio Gang received the Honor Award for the Kresge College renewal project at the San Francisco chapter of the American Institute of Architects’ 2024 Architecture Awards. (Shmuel Thaler – Santa Cruz Sentinel)
