Oil stain in concrete

[Capt Retardo and the Skidmarks]

hogwash... muriatic acid will etch the concrete if it's not rinsed properly but the cement won't turn into a puddle of goo just because you but muriatic acid on it.

check out the net, it's a common way to clean heavily soiled concrete. It's even a "use" listed on the bottle of acid.

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[K. Collier]

But... I would never use it at full strength.

[effi]

these are very important points if you don't want toxic material or acid rinsed into your yard and the water system, something other substances mentioned here cannot be touted for