Dissolves grease and ground-in dirt. Pre-treats heavily soiled carpet. Use as a pre-treatment for heavily-soiled, high traffic areas such as hallways and entries; Deep-penetrating action lifts ground-in dirt and greasy stains. Rug Doctor Hi-Traffic Pre-Treatment is a powerful pre-cleaning agent that removes tracked-in dirt, spills, and stains. It's specially designed to lift dirt and grease from areas of heavy use prior to the regular carpet cleaning process. Approved by DuPont and Monsanto (Solutia) for use on stain-resistant carpets.