Spot vs. stain A spot sits on the fiber, a stain becomes the fiber
When we look at a discolored area we are answering one question first: is the substance still on top of the carpet, or has it replaced the dye inside the yarn. A spot lifts with the right rinse and agitation. A stain has changed the color of the fiber itself and behaves more like a fabric dye job than a cleaning job.
Coffee, juice, and most food spills start as spots and turn into stains the longer they dry. Red dye, mustard, and some plant-based spills can cross that line in hours, especially on polyester carpet, which holds onto color differently than nylon.
We tell you which one we are looking at before we touch it. That is the only honest way to quote a stain removal job.