One part Dawn dishwashing liquid mixed with two parts HYDROGEN PEROXIDE. Add baking soda for scrubbing help. Use laundry brush to work into the stain. Supposed to actually take yellow armpit stains out of white shirts!
How to Remove Oil Stains or Grease Stains from Clothes
Fabric Softener 1 quart glass bottle of white vinegar, add 25 drops of Lavender essential oil + 1 tsp rubbing alcohol (for emulsion). Pour cup into the rinse cycle or into a fabric softener receptacle and start the wash cycle.