Pipe cleaner
Overview
 
A pipe cleaner or chenille stem is a type of brush
Brush
A brush is a tool with bristles, wire or other filaments, used for cleaning, grooming hair, make up, painting, surface finishing and for many other purposes. It is one of the most basic and versatile tools known to mankind, and the average household may contain several dozen varieties...

 originally intended for cleaning dottle
Dottle
Dottle is the wet and sour-smelling mass of unburned tobacco found at the bottom of a tobacco pipe. Dottle is produced by a combination of two reasons, first the smoker is a "wet smoker", that is, he pushes a considerable amount of saliva down the stem and into the bowl, and second the tobacco...

 from smoking pipes. Besides cleaning pipes, they can be used for any application that calls for cleaning out small bores or tight places. Special pipe cleaners are manufactured specifically for cleaning out medical apparatus and for engineering applications. They are popular for catching drips, bundling things together, colour coding, and applying paints, oils, solvents, greases, and similar substances.
Smoking pipe cleaners normally use some absorbent material, usually cotton
Cotton
Cotton is a soft, fluffy staple fiber that grows in a boll, or protective capsule, around the seeds of cotton plants of the genus Gossypium. The fiber is almost pure cellulose. The botanical purpose of cotton fiber is to aid in seed dispersal....

 or sometimes viscose
Viscose
Viscose is a viscous organic liquid used to make rayon and cellophane. Viscose is becoming synonymous with rayon, a soft material commonly used in shirts, shorts, coats, jackets, and other outer wear.-Manufacture:...

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