For concrete oil stains: Oil-Dry
Advanced Steps:
1. Use a Heavy duty de-greaser, Scrub with a stiff brush.
2. Power wash w/water and soap.
3. Let Dry
4. Cover stain in Oil-Dry
5.
IMPORTANT: Wear Eye/Breathing protection (Oil-dry has Silica, dont breathe it in. It will turn to powder in step 6)
6. Use a standard brick and grind in the oil dry in circular motion, take your time, let the weight of the brick do the job. Working to fast will lift dust into the air.
https://www.youtube.com/watch?v=G5LEEcOtFek
https://www.youtube.com/watch?v=5AjOCd17UYU
Can be found on Lowes/Walmart/Pep Boys