Some of today’s carpets have natural stain resistance depending on their fiber. All carpets come from the mills come with a protector applied. Industry standards recommend reapplying a protector after a clean, protecting the fiber from the inside out. Soils, dyes, oils, etc. do not bound as easily to fiber, allowing for easy removal. Your spills will sit on the surface longer. Also, regular vacuuming will remove more soil from a protected carpet.