Over the past few weeks, there has been a growing spot on my driveway where I drive my car into the garage. The spot is made up of a very fine black powdery dust.
Right where this spot is located, there is a small bump as the wheels enter the garage. The location of this spot does not line up with anything I can think of that would be dropping the dust. I cleaned it up 1 week ago and as you can see from the pictures, it is back.
It is too far towards the middle of the car to be brake dust. The only thing that I see that lines up with the spot is the driver side muffler, which I have checked and see no leaks.
Any ideas what the source of this dust might be.