As remove mildew stains on clothing

To remove mildew stains on the clothes, you can make a dough with vinegar and baking soda, apply it on the stain and then wash as usual.

Another option would be placing the garment in milk at room temperature for 2 hours. Repeat this operation if necessary. The latest spots disappear with bleach.
If it is fine clothes, bathe part stained with hydrogen peroxide or with diluted bleach.

For if the mildew stains are in leather, they must rub with terpentina or turpentine.