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.
Relief sculpture
Some different types of sculpture are:relief sculpturefree standing sculpturekinetic sculptureassemblage 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?...
Ninevah
Relief sculpture.
Sculpture
Figures are carved in high relief with deep undercutting.