Speaking from personal experience...I used ReKrete on a residential drive that a contractors truck had blown an engine on. 30+ feet of oil from 5' to 1' wide. The homeowner was p.o'd. There had already been 3 companies attempt to remove the oil. I went out, tried the "grind the kitty litter routine" and realized there was too large an area for that to be practical.
I applied the ReKrete with a cup, spread it with a broom and brushed-off as much excess as I could. In addition to virtually making the oil stain disappear, it brightened to older, yellowed concrete too. I was called back to apply ReKrete to the entire drive because it looked so nice.
I have returned to observe this driveway (its now been 2 years) and it still looks great. Thee is still a faint outline of where the original spill was, but the color is holding on.
I recently applied ReKrete to an office buildings apron on 2 sides. (I ran out) Before I could order more, mgmt decided they wanted it power washed instead. After power washing, they are now upset at how it looks - which is how it normally looks - dingy. Ah well.