Mitch,

Distilled white vinegar will take care of your mold problem, but you should make sure you use clean cloths to apply and throw them away and do not be tempted to reuse. Some recommend that you dilute 50-50 with water, but I apply more liberally, and I have not had a problem with leather. Mold spores are a challenge to get rid of unless you get aggressive. I have no clue how vinegar will effect stock finishes, but I know it will eliminate the mold.

NCTarheel