I'm rather new to large format photography and I just obtained a 90mm 6.8 Schneider-Kreuznach Angulon for a steal. The shutter and the lens are clean and functional but there is some form of residue buildup on the threads. I would greatly appreciate it if anyone can help me identify the buildup and give some advice on how to clean it. ( I need to move the lens to another lensboard and its stuck.)
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