Remove green cream fouling from leather sheath

Joined
Sep 11, 2016
Messages
6
Can anyone here tell me how to remove that "green cream" fouling
from a leather folding knife sheath?
I'm referring to the metal fouling from nickle or brass bolsters etc
on a folding hunter, left in a sheath too long.
Typically this is both deep at bottom, as well as near the opening.
Thank you.
 
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