You can buy engine degreaser which will do a pretty good job - either that or some orange cleaner. Anything which will break up the oil.
If it's an asphalt driveway, you probablly wont be able to make the oil stain dissapear. Asphalt is oil based so those drips really soak in over time. The only real way to get rid of them is to reseal the entire driveway to hide them.
Dave
|