Lube stains

Right, now I know it's a washable fabric I would try ACE in wash stain remover (apply some directly to the stain then add 100ml to your wash) or vanish stain remover it's in a bottle with 2 sides 1 is pink the other clear and when squeezed together they make one liquid which fizzes. The other thing to try is either OXY action powder or Vanish powder in with your normal powder, don't use a liquid as it's not strong enough to tackle a chemical based stain, It might take alot of doing as you may have inadvertantly "set" the stain with boil washing it, but, it's worth a try my friend.