Dawn dish washing liquid lifts many stains off concrete
Including paints and oils
Just apply it heavy straight from bottle and let it soak. I've let it soak for days, often wait for rain to do the rinse.
Otherwise go with the muriatic acid. If you do, wet the entire slab...then apply the acid over the entire slab. Lightly scrub the affected area with a stiff brush.
Sometimes, you have to lightly brush the whole slab to have a consistent finish when dry.
And, lots of rinse with water...gotta remove the acid or it will continue to etch the slab.
Pics of slab / affected area?
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