I had the hardest time removing a huge oil and grease stain from the front of my gore-tex ski jacket that occurred after a couple of winters of operating snow mobiles. I hadn’t worn the jacket in several years because the stain was so bad. I tried denatured and isopropyl alcohol, washed it numerous times, nothing worked! I finally tried mineral spirits, blotting it on with a sponge and then washing it afterwards. The stain came out! The mineral spirits was stinky but I air dried it outside for a few days and that took care of it. I’m excited to wear my old favorite ski jacket again this winter.