I've read online to use a 1:1 ration of rubbing alcohol and water to remove the mold...
Rubbing Alcohol is not leather-safe - it will further leach out the fatliquor that will leave the leather stiffer than before.
Handle the stiff leather gently, do not flex or fold it unnecessary - it might crack depending how severe it is - as the mold may have suck out all the fatliquor on these areas.
The stiffness need to by hydrated - to soften it again; thereafter fatliquored to return to its softness, strength and suppleness.
The mold is best removed physically; thereafter treated with a leather-safe fungicide; one treatment will last you 8 months; for a long term anti-microbial solution threat it thereafter.
Here is the kit that you might need; however its better you show us some pictures, so that help is more specific; we will walk you through!
Leather Doctor® Musty Odor Removal Kit-MO5
Contents:
d’Mold-3.6 - 250ml
Prep-7.7 - 60ml
Prep-4.4 - 60ml
Cleaner-3.8 - 250ml
Rinse-3.0 - 250ml
Hydrator-3.3 - 250ml
Fatliquor LS-5.5 - 250ml
Leather Scent-B - 120ml
Leather Scent-S - 120ml
Leather Eraser-4 - 1pc
Suede Eraser-5 - 1pc
Leather (horsehair) Brush-1 - 1pc
Nubuck (nylon) Brush-2 - 1pc
Suede (brass) Brush-3 - 1pc
3” Poly-Brush® - 1pc
Washable Rags - 5pcs
Roger Koh
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