To remove yellow armpit stain, saturate the stain with a remover, rub it with a toothbrush, launder the garment with hot water, and apply a solution of white vinegar and water to eliminate the remnants. Soak truly stubborn stains in aspirin solution, then wash the garment normally.
- Apply a stain remover
Apply laundry stain remover to the stain, and rub the area with an old toothbrush to work the solution into the stain and help break up the stain. Leave the remover on the stain for five minutes, and then launder the fabric with hot water. Air dry the cloth, and repeat the process until the stain disappears.
- Apply white vinegar
If the stain does not disappear, pour one part water into a bucket, add one part white vinegar, and mix to form a solution. Apply the solution to the stain, wash the cloth with hot water, and air dry it.
- Soak stubborn stains if necessary
Crush three aspirins, add it to a 1/2 cup of warm water, and stir the mixture. Dip the stain in the solution, and let it soak for three hours to facilitate the aspirin penetration. Launder the garment as normal, and then air dry it.