They're very slightly hard to find, but sites about archiving materials and art have some sound suggestions.
The most popular method seems to be freezing something with active mold for 72 hours to kill the mold, then removing by dabbing with an artists gum eraser, the one that's like clay.
Alcohol at 70% also seems popular, but should be tested on something less interesting or hidden, to be sure it won't affect the inks.
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