ELEPHANT SNOT is the workhorse for the most difficult of porous surface removal requirements - ELEPHANT SNOT penetrates deeply into concrete, cement, brick, grout, stone, virtually anything porous, to dissolve and loosen all types of tags. In many circumstances, a simple water hose pressure will do the job. Effective for use on spray painted graffiti, marker, pen, ink, crayon, shoe polish, lipstick, pencil and most other graffiti marks found on brick, mortar, masonry, cement, concrete, stucco, terrazzo, pavers and porous tile. Natural stone surfaces such as granite, marble, sandstone, rocks, both porous/rough or polished. Also effective on glass, ceramic, porcelain, glazed tiles and grout.