The Chem Sponge is used for removal of dry dirt, dust, hair and smoke/soot residues. On a lot of surfaces we try to avoid wet cleaning which often leads to smearing, smudging or staining and we can actually do more damage on certain surfaces than the fire did. These 2″ thick, porous dry cleaning chemical sponges are used primarily in smoke and soot removal in fire damage jobs. They work like large “erasers”, these rubber sponges drawing the dust, soot and smoke residue into the cells of the sponge material.