Hi, Carol. Did you try Tri Sodium Phosphate (TSP)? Put about a cup in a gallon of water and slosh it on the stain, then scrub with a stiff bristle brush and let it set for 10 minutes, then rinse with a hose. TSP is available in the paint department of your home center. Other than the scrubbing, don't work hard at this. It has to soak into the concrete to work. And the scrubbing can be done easily with a patio brush so you work standing up.
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