A backing plate that removably attaches a sponge to a mop head includes a top surface, that removably attaches to the mop head, and a bottom surface, to which the sponge is attached. At least one male attachment member is located on the first edge of the top surface of the backing plate, for removable...http://www.google.es/patents/US6058548?utm_source=gb-gplus-sharePatente US6058548 - Removable cleaning element from mop
