It can be very difficult to remove oil from polyester. Especially vegetable oils. Try applying straight dawn dish soap to the area, then stretch the fabric over a large bowl. Secure with a rubber band or string and pour very hot water through the stain.
You can also try WD40.
Try putting some Resolve on the stain and let it sit for a while and then launder.
Put a generous amount of dawn on the spot and let it sit over night. Then place it in the washer. I have tried this many times and it has worked.
Make sure it's BLUE Dawn!
Dawn dish soap
Use original Dawn dish soap. Soak the area ana let it sit for a few hours and then wash
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