You did not state what the sculpture was made from. This would determine how you clean it.
Sculpture is 3-dimensional.
Low relief sculpture is a technique in which the subject of the sculpture is just barely more prominent than the background. High relief sculpture is a technique in which the subject of the sculpture is very raised and extremely prominent against the background.
To clean a bonded sand relief sculpture, gently dust the surface with a soft, dry brush to remove loose particles and debris. For more stubborn dirt, lightly dampen a soft cloth with water and wipe the sculpture, avoiding excessive moisture. It’s important not to use harsh chemicals or abrasive materials, as these can damage the sculpture's surface. Always allow the sculpture to dry completely after cleaning to prevent mold or degradation.
Relief sculpture
A sculpture should be free standing. If it is not, it may be a relief: relief: sculpture consisting of shapes carved on a surface so as to stand out from the surrounding background
Regular sculpture is completely in the round, for example a 3-dimensional person or object, whereas a relief sculpture is usually fairly flat, like a picture, but is somewhat sculpted to appear to be coming off or out of the surface
Bas-relief is an art term used to describe a sculpture that has minimal depth to the faces of the human sculpture than they actually have in real life.
a relief sculpture?...
Relief sculpture.
Ninevah
Sculpture
Relief is a kind of sculpture. Click link below to read more about it.