Turn the shirt inside out
Brush off any loose deodorant residue
Rub the stain gently with a damp microfiber cloth
Apply a small amount of white vinegar to the stain
Let it sit for 5 to 10 minutes
Gently rub the fabric together
Rinse with cold water
Make a paste with baking soda and water
Apply the paste to the stain
Let it sit for 15 to 20 minutes
Rinse thoroughly
Use a small amount of liquid laundry detergent on the stain
Gently work it into the fabric
Wash the shirt in cold water
Air dry the shirt
Repeat if needed before using heat
Avoid putting the shirt in the dryer until the stain is gone