Oil stain in concrete

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the oil is in the porous concrete so you may never get the stain out
most of the techniques mentioned so far seem to have abrasion as a common theme, and will probably involve removing a little of the surface cement from the concrete, by rubbing it with a brick, etching it with toxic muriatic acid, or using a pressure washer on it
anything you use (chemicals, etc.) to clean concrete that does not evaporate can penetrate the concrete
using chemicals then flushing them off the concrete with water after cleaning can introduce toxic pollutants into the water system
removing some of the surface cement will: 1. make the slab thinnner (even if only by a mm or two, possibly of no significance) 2. reveal more of the small rocks and pebbles in the concrete (as opposed to the smooth surface the cement was) 3. open the pores of the concrete so it is susceptible to more stains, from oils, grit from asphalt roofing shingles, dirt from car tires, stains from plants, etc. (unless you seal the concrete with a sealer, clear or stain or paint colors) 4. make the treated area different in appearance than the rest of the slab
quikrete makes products you may find of interest:
concrete cleaner http://www.quikrete.com/catalog/ConcreteAsphaltCleaner.html (notice it is "Non-toxic, non-flammable and contains no acid.")
concrete sealer (clear) http://www.quikrete.com/catalog/AcrylicConcreteCureAndSeal.html
these are made for concrete, and should outperform other products not made for concrete, kinda like washing a car with car washing detergent vs. diswashing detergent (the latter being a terrible idea, it ruins paint after enough washings, look at all the faded paint jobs on cars)
there are other companies besides quikrete that make products (cleaners, sealers, etc.) specifically for concrete
sealers (clear, stains, or paints) are applied after cleaning concrete to help make the concrete more impervious to absorbing stains
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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

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Spread used oil over the rest of the drive way untill it matches the old oil stain. Start in a inconspicous area first untill you have the technique down. Then do the whole thing.
John - that or don't get so uptight about a driveway.
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