If you notice black or green stains on your clothing, mildew is likely the cause. Mildew is a fungus that thrives in moist environments. If your clothes remain wet or damp for an extended period of time, mildew stains may form. There is no need to throw out an otherwise intact garment simply because of a mildew stain. Removing mildew stains from clothing is simple using the proper products and procedures.
Brush off as much of the mildew as possible with a dry scrub brush. Work outdoors.
Launder the clothing as usual. If the clothing is white, add ¼ cup chlorine bleach to the wash cycle.
Lay the clothing out in the sun to dry. The sun is a natural mould and mildew inhibitor. Do not place the clothing in the dryer; the heat will set in the mildew stains.
Add 2 cups of borax powder to 2 qts. warm water in a bucket or sink if the mildew stain persists.
Place the mildew-stained clothing into the solution. Make sure that the mildew stain is completely saturate with the liquid. Allow the clothing to soak for a few hours. Remove the clothing and rinse it in plain, warm water.
Launder the clothing as usual. Do not place the clothing in the dryer until you are sure all of the mildew has been removed.
Always test the product you are using on a small, inconspicuous area of the clothing prior to applying it to a more noticeable area.
Never mix bleach and ammonia, or products containing these ingredients. The results could be fatal.