Motor oil cleanup?

[smeacham]

Any suggestions on how to clean up a mess made by squatters (vandals, really)? They dumped copious amounts of what looks like motor oilj, covering much of approximately 10’x20’ of ground that could otherwise be planted or at least be allowed to heal and grow. Of course, it’s soaked into the ground over months and killed everything but a few weeds. It makes me sick to see the land like that, and I’d like to heal it rather than cover it up with cinders.

Steve