Turn the shirt inside out
Rinse the stained area with cold water
Make a paste with baking soda and water
Rub the paste into the stain
Let it sit for 30 to 60 minutes
Apply white vinegar to the area
Gently scrub with a soft brush or toothbrush
Wash with enzyme-based detergent
Use the hottest water safe for the fabric
Check the stain before drying
Repeat treatment if needed
Avoid machine drying until the stain is gone