A product for removing various types of discoloration, efflorescence and dirt from facades, ceramic tiles, natural and artificial stone and other acid-resistant materials. The product quickly and effectively removes dirt resulting from everyday use caused by environmental conditions (stains, dust and dust deposits, discoloration), as well as remains of mortars, grouts and cement. Warning! do not use the product on materials that react with acids, such as: marble, aluminum, chrome surfaces. The product is diluted with cold water, in proportions depending on the degree of surface contamination from 1: 1 (heavy dirt, grout and cement dirt) to 1:20 (light dirt, dust).