I heard from a mechanic that there is a way! This is for engine oil but try it anyway. Take some dishwasher soap(sunlight, liquid). Drizzle it on the floor with some water to dilute it a bit. Mix it around on the stain. Put a black garbage bag over it and wait overnight. This is supposed to draw th oil out of the cement. Take the plastic off and simply wipe it up with an old rag. Good Luck.