Concrete Oil Stain Removal

So what is the process?
My outdoor kitchen slab is 22x24. I port a couple gallons on it, use a 30" long handle squeegee to cover the entire slab, then let sit for long enough to finish a pint, then hose off. Don't do this if it's a confined space. Don't do this while wearing your size 16 flip flops either!
Stubborn areas may take a second application.
 
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