[j-c-c]

I would think the enzyme solution would be most effective, requires time and likely reapplication. Left over minute amounts of previous cleaners might unintentionally thwart that process.
When oil seeps into the microscopic cracks/crevices in concrete, no water-based detergents can penetrate past the initial contact surface enough, to prevent later the oil from migrating back to the surface and becoming once again visible.

I would like to explore for faster method on concrete an organic solvent like lacquer thinner or acetone liberally applied on very dry concrete, and left to dry, and minutes later, reapplied, and then ignited, the thinking being, it will penetrate the concrete, it will dissolve with the left-over oil and/or remanents, and the burning will draw/wick the visible oils/solids to the surface for removal. It will Not get hot enough to damage the concrete, as the heat will want to rise away from the concrete, and the duration will be less than a minute as it flashes off.

The subtle message above is dry concrete, as moisture in concrete is what causes most damage to concrete when heated above 212F which turns to steam and spalls the concrete.