People often wonder: What is a microfiber cleaning cloth? Microfiber is defined as a fiber that is 1 denier or less. What is a denier? It’s a measurement of fineness equal to a unit of fiber that weighs one gram for each 9000 meters…meaning it is really small. To put it in perspective, microfiber is 1/100 the diameter of a human hair and 1/20 the diameter of a strand of silk. One square inch of microfiber cloth has approximately 200,000 fibers. Brush is designed to make cleaning easy. It is embedded with long plastic bristles that reach deep and effectively scrub away dust, spilled food and other impurities from hard to reach places. It can be used to clean rugs or carpets without damaging the surface. It can be used at home, office or even inside the car for cleaning.