Rejuv , bake in an oven, or my personal fav, HOT water and soap in a bucket for about 20+ minutes, dump the water, new HOT water and soap for another 20+ minutes, then rinse and wipe off. this will help get the oil to the surface with the heat, and the soapy water with help dissipate it.
I use Qwik Strike from Bio-Kleen Products (USBC Approved) as a pre-soak, and then I use their Super Suds in the hot water. works great for me