Why the magic sponge become smaller and smaller?

The magic sponge become smaller and smaller is a normal phenomenon. " magic sponge" is composed of micro particles which are less than one hundred thousandth of the diameter of a hair. And it mainly depends on the automatic stains absorbing ability of the capillary openings inside the nano-structure to achieve its cleaning effect.

Magic sponge is a kind of consumable like erasers. It will become more and more smaller in the consumed. Its spending rate is up to the unevenness of the surface. In the process of the constant friction between the sponge and the surface, the dirt is removed slowly. As being worn in the process, the sponge becomes smaller and smaller, finally disappears. So the unevenness the surface is the faster the sponge will be worn.