Hi,
I discussed this issue with one of the organic chemists at my company and he recomended acetic acid (ie. vinegar). Distilled white vinegar is sterile unlike cider or wine vinegar which many still contain the "mother" bacteria. Concentrated or "glacial" acetic acid avaiable from chemical suppliers is a very effective cleaner but appropriate chemical safety measures must be practiced (goggles, lab coat, acid vapor mask or fume hood). He also suggested high percentage ethanol or isopropanol as this should extract any thing that might get extracted by the cider, wine or beer. Going to try distilled white vineger followed by an ethanol rinse before I mess with vegitable oil.
Norwest