Cleaning a oil stain on a driveway

[PantherPaul]

What's the best thing to clean an oil stain on a concrete driveway that's been there a while. Cat litter already used. Pressure washer done as well. Isn't there some type of acid to use

[wossa]

Dawn

and a good stiff brush

[EastOfRaleigh]

PantherPaul, I tried virtually everything several yr's ago & finally gave up. Sorry.
if you discover something that actually does work well, please share.
Is it inside a garage or on outside like a driveway.
Could you use one of the concrete coatings, like a paint? Don't know much about them.