HIGH TRAFFIC AREA

I just recently ran into my first stain i couldint get out . The area was a high traffic area that led to the bed room the rug is very thick when i was done it looked as if i removed all the soil from the rug but it was still a tad bit darker than the rest of the rug. I was very frustrated that i spent 40min trying to get this area cleaned this was a week ago and i still cant stop thinking about it. I was told it could just be wear an tear but not sure if this is correct.

The carpet fibers have been scratched up so badly they can't reflect light back like the other fibers not subjected the same abuse.  Sell the customer on teflon coatings and tell him or her it is 5 passes per day 5 seconds per pass on every traffic area to prevent further damage.  You are making the carpet clean, not new.  Some people believe that if they have smoked all their lives and have been diagnosed with lung cancer that if they stop smoking now the doctor will give them a pill that makes it like they never smoked.  Same mentality.