Removing oil patch on concrete

Is there any way this can be done. For a new oil spot I've used washing powder and this has sort of worked. However for "old" patches accumulated over a couple of years what's the best way of getting rid of them? Is it possible?
I know I could have googled but wary of snake oil products or a product's effectiveness.

  Quoted Text Here  
I used to use 'Gunk' engine cleaner which was very effective at emulsifying the oil, then hose down.
Don't know if this drive cleaner is as effective: http://tinyurl.com/m2fdj
Slurp

|
| |> Is there any way this can be done. For a new oil spot I've used washing |> powder and this has sort of worked. However for "old" patches accumulated |> over a couple of years what's the best way of getting rid of them? Is it |> possible? |> |> I know I could have googled but wary of snake oil products or a product's |> effectiveness. |> |> |I used to use 'Gunk' engine cleaner which was very effective at emulsifying |the oil, then hose down.
Damn you beat me to 'Gunk', but I would leave it on for as long as possible before hosing it down. Repeat if necessary.

  Quoted Text Here  
I've just looked at my own 1 litre can: It's advertised as "The World's Best Selling Engine Cleaning Degreasant". With that claim, it must be up to the job.
Sylvain.
  Quoted Text Here  

Fred wrote:
  Quoted Text Here  
For my block pavers I have applied "Gunk" to the stain with a stiff brush and washed off thoroughly after each application ( one usually works). Its been very effective AFAIC. Not tried it for concrete but might be worth a try.

On Sun, 1 Oct 2006 12:31:38 +0100, Fred wrote:
  Quoted Text Here  
Neat washing up liquid, with prehaps a little water, worked well in and left for the rain to wash away.

Fred wrote:
  Quoted Text Here  
New or a few days old oil stains can be got rid of with its counter part *petrol* old oil stains can be almost got rid of using petrol over a few months repeating and scrubbing. The old oil needs to be revived.

  Quoted Text Here  
Many thanks for all the replies. It's seems that Gunk has the upper hand. I'm not sure about petrol since it isn't miscible with water and while it might "rejuvenate" oil patches it would probably be best to use in association with Gunk.
Many thanks again.

Fred wrote:
  Quoted Text Here  
miscible?
Suit yourself, I had ground in oil stains (possibly been there for some years?)out side my house on the flagstones which where proving a bugger to remove a garage recommended petrol scrubbed in daily for a month or so till the oil became revived and then scrubbed with washing up liquid weekly, presently the oil stains are now a very light grey appearence almost the same colour as the paving slabs.
ps I have tried gunk to no avail. :-)

  Quoted Text Here  
As in able to dissolve rather remaining separate as in oil and water.
  Quoted Text Here  
OK - many thanks.

Fred wrote:
  Quoted Text Here  
why is this word not in the dictionary?

  Quoted Text Here  
It's a word I've known since 'O' level chemistry. I assume it's still taught. It's also in the freebie Wordweb dictionary I've installed on the PC.
miscible: (chemistry, physics) capable of mixing
For a more in-depth discussion there's: http://en.wikipedia.org/wiki/Miscible
What dictionary were you using?

wrote:
|Fred wrote:
|>> |>> miscible? |>> |> As in able to dissolve rather remaining separate as in oil and water. |> | |why is this word not in the dictionary?
google "define:MISCIBLE" gives
  Quoted Text Here  
Definitions of MISCIBLE on the Web:
Miscible means able to be mixed. Two liquids are said to be miscible if they are partially or completely soluble in each other. Commonly, the term miscible is understood to mean that the two liquids are completely soluble in each other. (See also Solubility.) ccinfoweb.ccohs.ca/help/msds/msdstermse.html
capable of being mixed in any concentration without separation of phases; eg, water and ethyl alcohol are miscible. www.oilanalysis.com/dictionary/default.asp
liquids form one homogeneous liquid phase regardless of the amount of either component present. A good example is methanol in water. www.ilpi.com/msds/ref/solubility.html
two things, like liquids, or polymers, that mix together completely to form a solution. Compare to immiscible. www.pslc.ws/macrog/kidsmac/glossary.htm
The ability of a liquid or gas, to dissolve uniformly in another liquid or gas. www.arb.ca.gov/toxics/tac/appendxc.htm
liquids that can be mixed in all proportions (any ratio) www.hubhobbyshop.com/paintimg.htm
two or more liquids that are soluble in one another. wblrd.sk.ca/~chem30_dev/appendix/glossary.htm
(chemistry, physics) capable of being mixed wordnet.princeton.edu/perl/webwn
The chemistry term miscible refers to the property of various liquids that allows them to be mixed together. By contrast, substances are said to be immiscible if they cannot be mixed together, e.g oil and water. en.wikipedia.org/wiki/Miscible <<<