Thanks Alan...vinegar and WD 40 it is!
When you mentioned "wrapping the blade in plastic" I am guessing a seran-wrap/cling wrap type of thing, and if so, can it still be stored in the sheath this way? Again, thank you for all your help with this...as if I didn't see it before, learning and understanding the weapons we preserve and appreciate is a lifelong pursuit...one I think most all of us happily accept!
all my best,
John