A hand operated butterfly sponge mop or regular sponge mop with a unique disposable sponge assembly where the sponge is retained by ratchet teeth respectively engaging a notch on a pair of notched collars molded onto the sponge. The sponge is retained in a closed position against the lower surface of the main body by ratchet teeth engaged in notches of a respective notched collar to overcome a force of downward force compression springs. When the respective button attached to a respective tooth is pressed down to overcome a biasing spring force which caused the teeth to be engaged with the notches, the downward spring force of the force compression springs cause the sponge to move away from the main body so that the dirty sponge falls away into a trash receptacle without requiring a user to handle the dirty sponge.