>>28507586
>One day I decided to clean my front door and noticed all this black dust on the door. 1 month later and all the black dust had returned. I looked into it and it was a combination of diesel soot + brake dust.
Or maybe dirt, dust and pollen kicked up by the wind as you would expect of something that's outside? I live in the middle of flyover nowhere and every time I power wash my siding tons of black junk washes off and I don't blame it on cars because it's not from cars.