Buy some powder Tide detergent. Sprinkle heavly on oil stain and let
it set. It will soak up of the excess oil. After it has set for a
hour or so shovel up the the oil soaked tide. Sprinkle another very
light layer and scrub with a broom. Then hose it off.
I haven't personally tried it, but maybe this stuff would work:
http://www.latexite.com/pr-cleaner.html
Seems to (I *think*) work with your garden hose, and it's available
at Home Depot.
- Logan
Cat litter or oil dry. Put it on, smash it down by walking on it,
leave it. Sweep up. Repeat until stain is gone.
Wouldn't it work better to sprinkle some generic clay cat litter first
to soak up the oil, shovel off and then do a two part Tide wash (make
a paste of Tide and allow to sit on the stain, scrub with the broom or
brush and then rinse, repeat once more?).
Since you had two years to do something about it (put a piece of cardboard
under the car, get the leak fixed) and didn't, presumably you're willing to
take some time fixing the problem as well.
The easiest and cheapest thing to do is nothing, provided of course you're
not still adding to the problem. Don't park whatever car you have now over
the stain, leave it exposed - natural weathering and decay will erase the
stain in a year or two.
Car has been fixed for several months now, so not a problem. I
recently received a letter from the homeowner's association asking to
remove the stains.