Hey , since ive gotten the deville to stop leaking all fluids im now working on a new project . Our driveway has 2 areas where the caddy has been parked over the last year . These areas have spots made from tranny oil and engine oil .

So today ive done a little research and have found a Chemical called Tri Sodium Phosphate . Im gonna give this a try . the other chemicals i have used were for fresh oil spots , your run of the mill powdered oil absorbants and the like .

So ill keep everyone posted on how this chemical will work out , i got the idea here : http://www.bobvila.com/wwwboard/messages/10121.html

That's interesting, it must absord the oil, etc. My Dad always made me put cardboard with a brick to hold it down under my car for when I visited. (old Pontiac) :rant2:

After cleaning I recommend sealing your driveway.....we have brick pavers and sealed them when we moved into the house........after seeing leaks from other peoples cars on our driveway it really pissed me off....but then I realized it just wipes up or hoses away. Definently seal your driveway.

You know it will just evaporate completely in a year. But i guess if your stain is extremely big getting that phosphate stuff should work good as long as it does not disolve your concrete, hehe, I hope not.