Here are some ideas John,
Leather goods can also be protected by wiping them with a solution of 3/8 ounce (11 grams) of salicylanilide in 1 quart (0.95 liters) of rubbing alcohol. Dry the articles before putting them away.
To remove mildew from leather goods, wipe with a cloth moistened with diluted alcohol (1 cup denatured or rubbing alcohol to 1 cup water). Dry in a current of air. If mildew remains, wash with thick suds made from a mild soap or detergent, saddle soap, or a soap containing a germicide or fungicide. Then wipe with a damp cloth and dry in an airy place. Polish leather shoes and luggage with a good wax dressing.
Shoes contaminated with fungus growth on the inside often develop unpleasant odors, and colored mildew shows up on the inner sole and linings and up into the toe. You can remove this kind of mildew with low-pressure sprays especially intended for freshening shoes; these sprays are available at shoe and department stores. Use these products as directed.
Another way to stop mold growth in leather goods is to place the leather goods in a container along with crystals of commercially prepared paradichlorobenzene-paraformaldehyde. Close the container tightly and allow the chemicals to vaporize.
The vapors from these chemicals are effective in killing molds that have grown into leather, but they give no lasting protection against future contamination. As the vapors leak out, the chemicals must be replaced. Before using the shoes or luggage, air them thoroughly.
Hope this might help.
Storm