Hydrogen Peroxide and Baking Soda
Take ¼ cup of hydrogen peroxide and ¼ cup of baking soda in a bowl. Add water to it and mix till all the ingredients are completely blended. When this is done, pour this solution on the stained area and let is stay there for at least ½ an hour. After this, with an old toothbrush, rub the stained area gently to remove the residue. Once this is done, you can wash the garment in the usual manner with color or warm water.