Removing black oil from skin or clothes — baby oil, oil based suntan oil (particularly useful info for sunbathers at the beach who step in oil spill debris)
For the removal of oil or fat stains, try corn flour rubbed into the stain and left for about 20 minutes then brushed off with a soft cloth or brush. This may need several applications for a good result. Speed up the process if you wish by placing a paper towel above and below the treated stain and running a hot steam iron over it.
Citrus oil (actually, citrus turpine) products–These are made from natural, steam distilled citrus oils, which are natural solvents. They are not non-toxic, but they have the lowest toxicity of all solvents.