Mix 1 cup of rubbing alcohol with 1 cup of water in a bowl.
If you don`t have rubbing alcohol at your house already,
it can be purchased at any drug store.
Do not use alcohol that you would drink as a substitute as it may ruin the leather.
Moisten a clean cloth in the rubbing alcohol and water mixture.
Wipe the area on the leather item that you want to remove mildew from.
You do not have to rub hard,
but make sure that you wipe it down thoroughly.
Leave the leather item alone to allow the cleaning mixture to dry.
If it is a piece of leather clothing or an accessory,
place the item on a hanger or somewhere flat to dry.
When the item is completely dry,
the alcohol will have removed the mildew from the item.
If you wish,
you can repeat these steps over again,
just to make sure that all of the mildew is removed from the leather.