I had a huge spot of grease on my white Isis ski pants.
I asked my grandma, because grandma's know everything.
She said Lestoil, and just happened to have a little in a bottle she'd had for close to 20 years. I vaguely remembered my mom using that stuff on dad's work clothes and thinking it stunk really bad.
But I graciously took about a 1/4 cup of it with me, got home, and hesitantly put some on the spot. A few rubs, and I visually watched the grease break up and separate from the fabric!!!!!
I did have to wash the pants again with some febreeze because lestoil stinks, but I couldn't imagine anything getting the grease out as effectively as grandma's lestoil