Mysterious leak

[romans909]

2015 BMW X5 35i , I got this mystery that I can’t solve , vehicle was facing toward the camera with a stain below the car , after seeing it i inspected for leaks found none, I took the car to mechanic and had them go over , no oil leaks , no coolant leaks , no transmission leaks, no brake fluid leaks it was dry underneath and nothing seemed out of place , car runs and drives fine . The only thing I did that day was have my AC turned on for half hour before parking it , celsius 5c / fahrenheit 40. But here’s the problem, if it was ac why the hell do I have a stain that a degreaser won’t remove ... any thoughts?

[turboawd]

Is that your driveway? Is it possible someone else pulled in and leaked all over?

[RED_Y_]

Do you use ice melt solution to de-ice your driveway? It will leave such stains.

[turboawd]

Did someone pee?

[romans909]

That is my driveway, it definitely was under my car and I don’t know if a prank by a neighbour or a grudge, don’t have any enemies I know of, I have a feelings it’s from my AC but can’t be sure why it stained so badly.

[romans909]

Originally Posted by RED_Y_

Do you use ice melt solution to de-ice your driveway? It will leave such stains.

Ice melt mix with water from AC? Not sure that would cause it

[devlinsky]

Some utility truck parked there, like plumber or something? If that would come from your car, you'd know it already, trust me.

[RED_Y_]

Originally Posted by romans909

Ice melt mix with water from AC? Not sure that would cause it

Just ice melt with some water/snow. Most people won't notice it on the asphalt but very visible on stone/brick.