Having carpet protectant applied, does not mean your carpet will no longer get dirty. Carpet Protectant helps your carpet resist dirt, spills, and everyday wear and tear. The protectant creates a barrier allowing you to clean up spills better and vacuum more effectively.
The majority of the carpeting in our homes comes out of the factory with a protectant already applied. After several years of wear this protectant is worn off, especially in the heavily trafficked areas. Carpet manufacturers advise reapplication of carpet protection 3 years after the carpet installation and at each cleaning thereafter.