Blot excess oil with a paper towel or clean cloth
Sprinkle baking soda, cornstarch, or talcum powder on the stain
Let it sit for 15 to 30 minutes
Brush off the powder
Apply a small amount of dish soap directly to the stain
Gently rub the fabric together or use a soft brush
Let it sit for 5 to 10 minutes
Wash the shirt in the hottest water safe for the fabric
Check the stain before drying
Repeat the process if the stain remains
Avoid putting the shirt in the dryer until the stain is gone