First -- get that oil leak fixed! Then apply kitty litter! ...most of it will soak up. Then use a commercial degreaser and wire scrub brush.
Yes- leak fixed! ( it’s my sons girlfriend car and I have gently asked if she is giving attention to it. I dont want to say “ please park in the street only”.
Simple Green works best. https://amzn.to/2lwBVp4
I have also heard cat litter
I haven’t tried it out yet but I just read DAWN does the trick! Let it sit on the stain for a while and then hose off. Good Luck!
Start with oil dry or cat litter to pull excess oils. Then use an automotive degreaser like Purple Power and a pressure washer.