What is safest way to remove oil stains from concrete driveway

https://www.angieslist.com/articles/tips-driveway-stain-removal.htm

Pour kitty litter on it and wait for it to soak up the oil. Then sweep and use a hose to remove.

Try using Super Clean (also called the purple stuff), I think because it's in a purple bottle. You can purchase this at any auto parts supply or any of the big box stores: HD, Lowes, Walmart.

I have heard that if you do this it works. Spray it down with the garden hose, take some Borax, and blue Dawn cover the oil stain. At this point work it in a bit with an outdoor broom being careful to keep the mixture on the stain. Let it sit for an hour or so. Go back wet a bit just enough to get a good scrub going, and scrub that stain for a few minutes. Now you have to rinse all that soap down the driveway and not in the grass, cause I'm not sure what the Borax would do to the grass. Maybe someone else would know . Good luck. ---GIGI

Kitty litter.

I use kitty litter, leave it on the stain for 1-2 days and sweep up. If some remain then use blue dawn dish soap and scrub in with a stiff bristled brush. Power wash after that.