If you do have mildew stains, washing with chlorine bleach will remove the stains from white clothing. For colored clothing use a mixture of color-safe oxygen bleach (1 teaspoon), and hydrogen ...

If the stain is gone, but the smell persists, launder with a vinegar wash followed up by a baking soda wash as instructed in the steps above. If you find your clothing is prone to mildew smells ...

Not only does it make clothing more vibrant (even dark clothes!), it kills mildew and is great for a variety of stains. Try white vinegar on tea/coffee, grass, tomato-based stains, sweat stains ...