On 11/11/2020 8:48 AM, major wrote:
Had a recent motor oil quart slowly leek onto a ribbed concrete surface.
Â*Not all of it leaked, but it left a slick about 2 feet in diameter.Â* I
have tried to clean it up with materials I had on hand, mainly absorbing
as much as I could with potting soil and sand, then scrubbing the
remainder with Dawn dishwashing liquid solution, paper towels dipped
into that, and then I would scrub.Â* Looks like I got most of it, but I
still see some remaining.Â* Best way to remove that would be welcome.
Thanks.

Found this:

https://www.wolfpaving.com/blog/clea...should-you-use

Since you have cleaned most of it up, I might try bleach as recommended
letting it soak in.