How do you remove rubber wheel chair tire marks from carpet?

Marilyn
by Marilyn
Just moved into our new home and carpet cleaner couldn't get a stained eight foot oval out of the short shag, oatmeal colored carpeting. The previous owner was in a wheel chair and the rubber tires have stained the carpet. Any suggestions. It is in the middle of the living room and looks to be a trail around the previous couch. Help please!

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