There are several ways to remove oil stains from concrete, including:

• Cat litter: Spread cat litter over the stain and let it sit for a few hours or overnight. Sweep up the litter and then scrub the stain with a bristle brush and detergent.

• Baking soda or powdered laundry detergent: Mix baking soda or powdered laundry detergent with water to create a paste. Scrub the paste onto the stain with a brush and then rinse with water.

• Degreaser: Apply a degreaser to the stain and let it sit for a few minutes. Scrub the stain with a brush and then rinse with water.

• Oven cleaner: Spray oven cleaner on the stain and let it sit for a few minutes. Scrub the stain with a brush and then rinse with water.

• Dish soap: Mix dish soap with hot water and scrub the stain with a brush. Rinse with water.

• Cola: Pour cola on the stain and let it sit for a few minutes. Scrub the stain with a brush and then rinse with water.

Regardless of the method used, its important to clean up oil stains as soon as possible, as fresh stains are easier to remove than older ones. It may take some trial and error to find the best method for a particular stain and type of concrete.