Abstract: A connecting device for a mop having a dissolving tablet or cleaning fluid dosing means has a monolithic piece that is substantially concave, and defines a lower opening and an upper opening; the upper opening being smaller than the lower opening. The upper opening of the monolithic piece is adapted to receive the handle of a mop. There is a sub-connecting device for connecting to the head of the mop around the handle of the mop; the sub-connecting device further comprises a lower edge. The monolithic piece has a lower edge with affixing means for detachably attaching to the lower edge of the sub-connecting device, so that the monolithic piece and the sub-connecting device define a cavity between the monolithic piece and the sub-connecting device suitable for holding a dissolving tablet or cleaning fluid dosing means.