Physically: Like many cleaning teeth the same way, we can not clean up then I'll give polished off the surface of this layer, leaving there is no contamination by ingredients. Of course, the operation can not move too much natural granite Curb, Curb every five lotus is a corresponding specification, if polished too much will not match the original specifications, and therefore by precise calculation, the Polished to a minimum. The merits of each of these two methods have, of course, there are a variety of shortcomings, chemically, does not change the specifications of Zhejiang granite stone curbs, but will change the composition of the stone so that it more susceptible to contamination; physically Shandong Granite Curb, not chemically changed as a component of stone, but many of the specifications of the stone should be changed so that it does not match the original. The best way is to cross the two cleaning methods used. Curb according to the different materials used, under normal circumstances is divided into two, the first one is that is concrete curbs, stone curbs second is according to curb cross-sectional dimensions can be divided into H-shaped road along Stone, T-Curb, R type Curb, F type Curb, TF-type and P-type stand along the stone porch stone.