Nano sponge contains a special cleaning material. Before use soak sponge softly in the water, then squeeze to remove excess water. Gently rub sponge over dirt- smudges and scuff marks. Rinse eraser between uses. Before use test on a non visible part of the surface to be cleaned. Do not use any cleaning chemical detergents to impede the loss of cleaning effect. Not suitable for lacquered, oiled or glossy surfaces.