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
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
4. make the treated area different in appearance than the rest of the slab
quikrete makes products you may find of interest:
(notice it is "Non-toxic, non-flammable and contains no acid.")
concrete sealer (clear)
these are made for concrete, and should outperform other products not made
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
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.
Remove the dead poet to e-mail, tho CC'd posts are unwelcome.
Ask me about joining the NRA.
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