One of the toughest area of carpet cleaning is the removal of traffic lanes. Traffic lanes are the patterns that develop in halls and choke points in the home like doorways and entryways where traffic is at its highest. The reason for the difficulty is two fold.
One reason is that there is naturally more dirt found in these areas. In addition, oil from asphalt is brought into the home at these entry points darkening out the carpet. All this oil and dirt is the easy part, it can (if done correctly) be removed completely with little to no discoloration.
The other side of the coin is wear. This is because (especially with the soil in Tyler and East Texas) sand is ground across the carpet between the carpet and our shoes. This scratches the carpet. In addition the tops of the carpet twists become frayed.
All this scratching and fraying causes light to bounce off the carpet differently. Most notably, not as much light returns to your eye. What this means is you get a darkening of the carpet that makes it look dirty… But its not, its just worn and unfortunately it cannot be repaired.
It is impossible to fix this darkening from wear but if your carpet is routinely cleaned by a professional carpet cleaner using hot water extraction, your carpet will last for years and years.