Almost all American-made synthetic carpet offer some sort of stain protection, which makes it easier than ever to remove spots. These treatments make carpet relatively impervious to spotting from food, beverages or pet accidents. But over time the protective chemicals can be worn away by heavy traffic. All carpet is ultimately a fiber. When treated with a stain treatment after cleaning, whether it is a stain resistant fiber o not, your carpet will be better equipped to repel stains.