Blot up any fresh oil with paper towels, rags, or cat litter
Cover the stain with baking soda, cornstarch, or clay-based absorbent
Let it sit for several hours or overnight
Sweep up the absorbent material
Apply dish soap or a concrete degreaser to the stain
Scrub with a stiff-bristle brush
Rinse with hot water
Repeat as needed
For stubborn stains, use a poultice made for concrete
For deep stains, apply a commercial oil stain remover
Pressure wash the area if appropriate
Seal the concrete after cleaning to help prevent future stains