Mops for pre-moistening Professional flat mops are made for pre-moistening. Mops are pre-impregnated with an ideal amount of water mixed with an appropriate amount of detergent. This means that the cleaner does not need to bring any additional water on the cleaning trolley. This ideal amount is often recommended by the manufacturer in terms of weight percentage of water per weight of the dry mop, for example "175% water per weight of the dry mop". Mops for pre-moistening are flat sheets of (often microfiber) textile, usually about wide, and come in variable lengths (usually ). Mops for pre-moistening are fastened on a handle with a flat pad mount with the aid of Velcro or a pouch on the mop, in which the pad on the handle fits. Pre-moistening can be done with a special washing machine, or by hand by simply folding and packing the mops tight in a container and pouring the measured amount of water over them. The mops will then need about 5–10 minutes for the liquid to distribute evenly in their tissue before use. This offers some advantages: The cleaner does not have to bring a heavy bucket of water when mopping the floor, but simply carries an appropriate number of mops. This means the weight of the equipment can often be kept lower. The risk of over-wetting the floor and leave puddles is reduced. Hot mop The hot mop (or steam mop) follows a similar concept to a steam iron. After adding water, the water is heated to make it exude on top of a floor, which can then be cleaned without using a cleaning solvent. These can work best on surfaces where a regular mop would also be used, such as bare floors, hearths, and laminate. Microfiber mop Microfiber mops are constructed of a blend of polyester and polyamide fibers which are "split" and formed into a single fiber. This blend consists of 70–90% polyester that serves as the scrubbing and cleaning fiber and 10–30% polyamide which performs as the holding and quick drying fiber. This blend is usually expressed as a ratio on the label of the mop, e.g. an 80% polyester and 20% polyamide blend would be labeled as "80/20". Sponge mop Sponge mop heads are constructed with a cellulosic, rubber, or plastic foam block, usually attached by crimping a metal clip on one side. Sometimes, the foam mop head may be