How about Dawn dish detergent? It has worked on some oil stains for me. Or Simple Green.
 
Ed Duntz> When i put the Orphan ('82 diesel Westy) on its roof last month most> all the crankcase oil drained into the body. An hour later when it> was put to rights, all that black sooted oil came draining back. I> have oil stains EVERYWHERE. Worst places are on my new canvas> (acrylic) and on the OEM curtains. I removed the worst one and> laundered it with double doses of detergent and Oxy-clean. Still has> a bunch of oil in it.
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