Evaporation will also take care of the lightest oils and for what's left you can probably pick it up with sorbent pads like these: http://store.andax.com/index.asp?Pag...RODGROUP&ID=39. That's not an endorsement for those pads or the company that makes or sells them, just an example.
I'd hesitate to use dispersants to break it up; no telling what those would do to your filter medium.
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