The eXpunge Plus removes dirt and stains with friction and will gradually disintegrate with repeated use. When the eXpunge Plus is used up, simply discard in a trash receptacle.Made from combination of sponge and melamine, eXpunge Plus eliminates dirt by lifting it from most hard surfaces. When moistened with tap water, white melamine erases stains, while green sponge in center retains moisture for continuous activation. No cleaning chemicals are required. Sponge will gradually disintegrate with repeated use and can be discarded in trash receptacle. It is safe for use on bathroom tile, counter tops, baseboards, and floors.