The fibers that are produced by insects or animals are known as protein fibers. Those that are made by plants are known as vegetable fibers. Vegetable and protein fibers share the common disadvantage that they are both very absorbent and will have extended drying times when wet cleaned - which can lead to mildew, shrinkage, and even dry rot. By the late 1960s, polyester was introduced into the carpet industry as a face yarn. In hand, feel, and appearance it is similar to nylon, although it doesn't possess that same resiliency. Polyester doesn't absorb water based spills, isn't affected by urine or kool-aid, but it will absorb oil based spills. These can be eliminated however, by a skilled operator who uses equipment that is well maintained and in good overall operating condition. Currently, there are two methods being used with steam carpet cleaning. 1. This method involves a traffic lane cleaner being sprayed onto the traffic lanes and then agitated into the fibers. They aren't just decorative items, but pieces of tradition, ethniticity, and true class that dates back thousands of years. Antique carpets represent enormous range in motifs and color harmonies and you'll simply lose yourself seeing the diverse combinations of rich antique colors and heavy intricate weaving. You can easily add carpet to steps, stairs, walls, posts, and other non level surfaces, without having to worry about it slipping, lifting, or buckling. Flexibility Carpet is the primary foundation in almost any room. Because it is available in a variety of different colors and textures, it helps to create an unlimited number of possibilities for decorating. Nylon is one of the most expensive types of synthetic fibers, although it is still cheaper than wool. Olefin is a low cost carpet material, often used for indoor or outdoor carpeting. Olefin is colorfast and strong, very easy to clean. One of the draw backs to olefin is that it can easily be crushed.