Bicycle tire mark

I cleaned a hallway in an apartment building yesterday and someone had ridden a bicycle down the hall, locked the brakes and slid to a stop thus leaving a black tire mark about four feet long down the center of the hall. The carpet is a standard commercial olefin, mostly beige in color. I tried everything in my spotter tray and extracted but the mark is still there. Just wondering if any of you have any ideas or have run into this?