Ok this one's for the conservators and leather goods folks on here. I work at a Western history museum and we are getting a selection of saddles ready for exhibit. However, I've noticed a nasty dark green waxy build up on one of the saddles wherever metal touches leather. This saddle may have been treated with saddle soap at some point and has almost certainly been polished with Renaissance wax at some. The leather does feel sticky to the touch. Does anybody have an idea about a) what is this green waxy build up? B) how do I get this stuff off the metal parts without damaging the leather? C) can I prevent it from coming back?

Thanks y'all! 

Mary "Kate" McCarthy
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