Presoak the stain in cold water for 30 minutes. This will loosen the stain on a washable garment. For older stains, add liquid detergent to the cold water.
Test the stain remover on the underside of the fabric or hidden seam. Rinse with water after 5 minutes. If there is no fading or bleeding, the stain remover is safe to use.
Place the garment, stain side down, onto an absorbent white cloth. Apply the stain remover to another white cloth, and gently dab the stain. Begin on the outer edge of the stain and work inward. Periodically rotate the bottom white cloth as it absorbs the stain.
Repeat the process until the entire stain is completely removed. If using a diluted bleach solution, thoroughly rinse the stained area with water between applications.
Wash the shirt according to the garment’s care label. Check for any residual stains before placing the garment in the dryer. If necessary, repeat the stain removal steps.