Recently we bought in an antique shop a statuette of the Virgin Mary inspired in the famous painting “The Madonna of the Chair” of Raphael. The statuette was covered by a patina of dirtiness and it had the face almost black. The result of years and years of dust accumulated.
I started to work on it immediately. With a fine brush and water with a special soap, very gently, I began to brush the delicate faces and the rest. It took me days to take all the dirt away. I had to be careful to take away only the dirt and not the original painting. I had to be very patient too. But the result was rewarding because the delicate features of the faces of the Virgin and the Child and the colours of their robes appeared. Finally we applied a transparent varnish to preserve the colours. And the job was done.
I think the outcome it was pretty good You can judge by the picture.