The pores of the stone are some darker material, such as ink, coffee and other substances inadvertently gets on the stone, and no time to clear, then such substances easily penetrate into the stone house, the stone surface of the infected difficult to eliminate stains. In such a case, first with the addition to the toner to clean up after the addition to the toner and dressing mixing into a paste covered in contaminated areas, then cover with plastic wrap, and so stains can be removed with water washing off, and then cured sufficiently. Sesame white board stock a large number of low-cost treatment to burn as follows: 300 * 600 * 2.5: 37 yuan / square, 300 * 600 * 50: 45 yuan / square. Curb: 800 yuan / cubic Order. Tel: 15836992808 road calculus http://www.nyzfsy.com