A wet mop or moist mop is, in professional cleaning, used as in the second step in the cleaning of a surface. The wet mop is swept over the surface to dissolve and absorb fat, mud, and dried-on liquid contaminations. Professional wet mops consist of a flat sheet of microfiber textile or a sheet with a surface of looped yarn (which might contain microfiber as well), usually about 15 cm (6 in) wide, and come in various lengths (usually 30100 cm (1239 in)).