With an equal mixture of white vinegar and cold water
Rub the vinegar into the stain and add it to washing machine
Add 1 tablespoon of baking soda in a spray bottle and fill the rest with vinegar
Add 2 tablespoons of vinegar to a cup of water
Wet the stain with water and add some white vinegar to it
Add 2 tablespoons of vinegar and a squirt of dish soap to warm water