Microfiber cloths are made from fibers smaller than a strand of silk. Oftentimes, they are a blend of polyester and polyamide (nylon) that are combined in such a way that the fibers split, creating more fibers per surface area with which to clean. This allows the fibers to pick up more dirt, dust, and bacteria. The porous nature of microfiber cloths also means they are very absorbent and dry quickly, making them more efficient and effective than cotton cleaning cloths.
Read about why communication is key when hotels adopt new, innovative housekeeping strategies here.