Mark - drive over to your local auto parts store, or big box hardware store, and pick up a bag of oil dri or other oil absorbent material. Lay the stock down in a long box on some of the oil dri and then pour some of it over the surface and leave it for a few days.
You'll be amazed at the result. I've been using that process for years to draw out oil from the head of, or cracks in, old stocks. Back when I started using it the stuff was called Speedy Dry. We used it to soak up spilled oils from the gas station repair shop bays.
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