What dishwashing liquid do you use? Try one of the concentrated ones. It might take a few washes but it will get it out I promise! Or what Tinks said. The only thing is often with oil stains you need to bring them back out again with more oil. Lucy (not Lulu ) started using oil spray and dishwashing liquid, my trick was WD40 and dishwashing liquid to get oily stains out. But the oil spray doesn't smell as bad as WD40 and works the same. you would literally need to drench the entire article in dishwashing liquid though once the stain is freshened and then wash as usual.