Because of stone material itself has wool stoma and water imbibition, air pollution, dust and acid gas in the air, vehicle exhaust, etc., accumulate over a long period to attached to the stone material surface, when it rains, will accelerate the pollution of acid rain erosion of stone material and adsorption in stone wool stoma, cause not easy cleaning blotch, especially for the fire stone, the faster of the pollution, and it is not easy to wash, the use of commercially available cleaning agents can not only remove the pollution; If smooth stone, the luster eroded away soon.
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