Cotton and viscose (rayon) yarns burn as a wick. The fibers are finer than viscose rayon. Some synthetic fibres are polyester, tencel, viscose, etc. These were found to include PVC, polyester, rayon and viscose, all derived from harmful chemicals. The cellulose solution is used to spin the viscose or the rayon fiber. Many fabrics are used including cotton, polyester, wool, viscose and silk to create the blinds. Recommended care for regular viscose rayon is dry-cleaning only. Acetate shares many similarities with viscose rayon, and was formerly considered as the same textile. "Regular rayon" (or "viscose") is the most widely produced form of rayon. Grasim is the world's largest producer of viscose rayon fiber with about 24% market share. In 2005 the production of viscose rayon was halted. This is usually the blend of polyester, modal, viscose, nylon, etc. Smoking pipe cleaners normally use some absorbent material, usually cotton or sometimes viscose. When made out of bamboo viscose it is also sometimes called bamboo silk. Most clothes are made from fine synthetic materials such as acetate and viscose.