David,
Have you used anything on that #5 ... like FLITZ ... to clean it up?
If you did ... any photos?
The experience I had while snowshoeing happened with my #15 in a combat master sheath also!
Not as bad as yours, but I got the spots out with FLITZ and put a coat of REN WAX on it.
Tony
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Tony LaPetri
RKS#1885
RKCC CM-022