As a mechanic and a printing press operator before that I have a lot of experience with this. GoJo or Goop hand cleaner works the best. Apply it to the stain on both sides before washing. Works every time.
I use this on work shirts that don't have much value so if the stain is on expensive clothing try it on something of little value first. Hope it helps.
Dan Hamilton Montana Mobile Oil & Lube Missoula, MT