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Message: <blockquote data-quote="jakeman" data-source="post: 4143223" data-attributes="member: 10690">You keep pouring muriatic on there and the stain will probably be gone, because the concrete will be gone.The hydrochloric acid won’t touch the oil, but it will etch the **** out of the concrete, which is why people think it’s a good cleaner for oil stains, but it isn’t. It just removes the stained concrete.Unless you want your drive way etched, stop using acid. Choose an alkaline degreaser/cleaner instead.Edited to add - you might try to find some TSP. The real **** not the TSP substitute or the phosphate free stuff. They suk. The real stuff is a really good degreaser though. There are also some enzyme type cleaners out there that contain petroleum eating little critters. Chemical Products in SW OKC used to make one called Terazime (sp) that was  a microbe petrochemical cleaner that was the bomb. CP was started by Clendon Thomas who was an ex OU running back or some such from back in the day. I used to just call him the All-American. No clue if they are still in business or not, but you can probably find a microbe type cleaner most anywhere.</blockquote>