I had my asphalt driveway repaved this spring, and of course my car has started leaking - ATF in this case.
How can I remove it?
First fix the leak! Then attack the stain with a bristle brush and some dish detergent; if that doesn't do it, there are commercial cleaners for asphalt or concrete, like this that are a bit stronger. Don't expect 100% results, but the stain will fade over time: