Dawn dish soap will work, but you can also try Goop hand cleaner. The sooner you get it on the stain, the better. I've never found anything to take that kind of stain out once it has been washed & dried.
Try shampoo on the spot and I would also use bar soap. Supposedly... the shampoo breaks down oils in the body. I've heard it's good to put in the laundry (wash) when you have oily clothes. Coca cola is also something that should help.
I have never tried this but I have read to add a can of Coca Cola to the wash along with your detergent for greasy clothes. For some reason, it stated to use Coca Cola only. Apparently, it works very well as a degreaser. Good luck.
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