Device for releasing and detaching a floor cleaning cloth from its base, where said base comprises: - a central element, called a retainer, connected with a handle and - at least two half-frames hinged together or to said retainer, placed between said half-frames; - a coupling device for keeping the two half-frames in a planar configuration; - a button that works together with said coupling device to release said planar configuration; a floor cleaning cloth with pockets at its transverse ends, into which pocket openings of the ends said two half-frames can enter, where said half-frames are kept in a planar configuration by said coupling device controlled by a release button, and where said half-frames are hinged, and whose free ends can tilt downwards with respect to said retainer; characterised by the fact that it comprises: - a raised cover with: - a side opening, on the longitudinal side of said cover, of such a length that it can allow said base to enter beneath said cover in a planar configuration with a cloth, where said cover has a width equal to at least half the width of the base, - a slot in the upper part of the cover in a central position extending further than the length of the retainer and less than the distance between the openings of the pockets of the cloth, - one or more connections, on one or more perimeter edges of said cover, to solidly fix said cover to the upper part of a bucket or a trolley. - a central element, called a retainer, connected with a handle and - at least two half-frames hinged together or to said retainer, placed between said half-frames; - a coupling device for keeping the two half-frames in a planar configuration; - a button that works together with said coupling device to release said planar configuration; a floor cleaning cloth with pockets at its transverse ends, into which pocket openings of the ends said two half-frames can enter, where said half-frames are kept in a planar configuration by said coupling device controlled by a release button, and where said half-frames are hinged, and whose free ends can tilt downwards with respect to said retainer; characterised by the fact that it comprises: - a raised cover with: - a side opening, on the longitudinal side of said cover, of such a length that it can allow said base to enter beneath said cover in a planar configuration with a cloth, where said cover has a width equal to at least half the width of the base, - a slot in the upper part of the cover in a central position extending further than the length of the retainer and less than the distance between the openings of the pockets of the cloth, - one or more connections, on one or more perimeter edges of said cover, to solidly fix said cover to the upper part of a bucket or a trolley. - a raised cover with: - a side opening, on the longitudinal side of said cover, of such a length that it can allow said base to enter beneath said cover in a planar configuration with a cloth, - a side opening, on the longitudinal side of said cover, of such a length that it can allow said base to enter beneath said cover in a planar configuration with a cloth, - a slot in the upper part of the cover in a central position extending further than the length of the retainer and less than the distance between the openings of the pockets of the cloth, - one or more connections, on one or more perimeter edges of said cover, to solidly fix said cover to the upper part of a bucket or a trolley.