My DH used to work at a Scrap Yard and I had to wash his uniforms. The only thing that got out any type of oil or grease stain was Lestoil and believe me, those grease stains were the worst. It is made by the Clorox company and is a Grease & Stain Remover that use put on the stains full strength and wait 10 lminutes. I bought a cheap little scrub brush and scrub it in before letting it stand. Then wash as you would normally. It has worked everytime even on ones that were missed and are set in. One warning, it stinks but once the clothes are washed, it is gone. Good luck.