The PVA sponge  has a strong water absorption, which can fully ensure the cleaning needs of the working head, so the collodion mop is the best choice for cleaning on the smooth floor such as the tile floor. The PVA head is an important part of the  mop. On a mop, the PVA sponge is responsible for removing dust, dirt and other functions, and directly contacts the ground. This mop is divided into two categories according to varieties: the first category, folding squeezing . The second type is roller squeeze type . Folding type and rolling type have their own advantages. 1. Folding squeeze PVA sponge mop head, small size, easy to replace, cheap. But at the same time, the mopping area is also small. 2. The volume of the roller PVA sponge head is bigger. The price should be more expensive according to the size of the rubber cotton head. It is not convenient to replace the half folded rubber cotton head, and most of the screws need to be installed. However, when mopping the floor, the contact area is larger, and the mopping is cleaner and labor-saving 1. Features of PVA mop: The cleaning head of mop made of PVA (polyol) sponge mop has super water absorption capacity, which is ten times as much as that of ordinary sponge. For convenience, just dip the rubber mop in water and gently pull it when cleaning