The four best ways to remove oil stains from concrete are.
Clean oil stain on concrete driveway.
Using a stiff bristled brush start scrubbing the area.
Wash away the oil with a strong detergent and a scrub brush or sponge use a concrete cleaner or degreaserto loosen and remove the oil apply a poultice that will break down the oil and suck it from the concrete.
If some oil still remains you can repeat the process as many times as needed.
In the bucket mix the detergent with the hot water stirring to combine thoroughly.
Leave the litter alone for at least an hour before sweeping or vacuuming it away.