Surface cleaning of reliefs

Similar to their treatment of the painted mural surfaces, conservators surface-cleaned the relief elements to remove significant layers of dirt and grime. They dusted the painted and gilded surfaces with a brush and vacuum, followed by a mild aqueous (water-based) cleaning solution applied with cotton swabs. Unlike the painted canvas, the reliefs’ surfaces generally lacked the wax coating presumably applied in a 1953 restoration. The absence of this coating facilitated cleaning.
 
The Triumph of Religion