Turn the shirt inside out
Brush off any dry residue
Mix cold water with a small amount of liquid laundry detergent
Apply the detergent directly to the stain
Gently rub the fabric against itself or with a soft brush
Let it sit for 10 to 15 minutes
Rinse with cold water
For stubborn stains, apply white vinegar or baking soda paste
Wash the shirt according to the care label
Air dry the shirt
Repeat before drying if the stain remains