Found this in a lot of uncleaned from the Balkans. From the look of it, it's probably one of the usual suspects, but the
quality and detail is very nice... the facial features were revealed during an initial rubbing, when a large chunk of debris flaked off. The remaining dirt is very hard. Situation is the same on the
reverse, but without enough showing to determine
type. What would be a recommended route to getting this cleaned up? Soaking, or will it need mechanical cleaning?
Toothpick and brush aren't producing any results, and I want to try to preserve the detail. I can see much more detail in the hair and features than shows up in the image.
Thanks!