Stone cleanser are numerous. Face with so many stone cleansers, how do users make decisions? First of all, users should know what kind the stain is, organic pollutant or inorganic pollutant. Secondly, make sure the variety and texture of stone, is it marble, granite, sandstone or slate? Thirdly, consider the circumstances of the part that will be cleaned, whether the construction is toxic in public places. Lastly, select the construction method and equipment. Besides, users also should check the items listed below 1. Appearance The liquid of stone cleansers should not have separated layer, suspended matter or sediment. The color of product should be consistent, not to change color in summer or winter. The color, hard and soft of gelatine and pulpiness should be the same. The spray kind product should have symmetrical effect. Powder product can not agglomeration, should be fine and symmetrical 2. SmellCheck whether the stone cleansers (including solid, gas and liquid) have pungent smell such as benzene, acetone, kerosene, fish-odor, gas or effluvium, which whether are forbidden by country law. Of course, none smell in stone cleansers is unpractical. But users should firstly test in part. The smell should disappear in short time, and can not transfer to other items. This is the key to judge whether the product contains pollution itself or it will form new pollution. 3. Stain cleaning effectIt means the ability it can clean out the stains. Stone cleaning is a project, it has time limited. So have good cleaning effect in short time is necessary. Test in part to see the cleaning effect. 4. ClearableAfter cleaning, the stone cleanser should be cleaned by water other materials, not leaving any smell or mark. 5. SecurityThere still is not national standard for stone cleansers yet. But users can refer to "interior decoration decorates material harmful material set limit to" 10 standards and "civil construction works indoor pollution control norms". Or users can send it to a certified testing. Some pungent smell will do harm to eye, nose, skin, respiratory system and so on. 6. Flash pointThis is the direct guideline to check whether the cleanser is flammable, explosive. Solvent base products and liquid products can refer to ASTMD39. 7. PH valueAt room temperature, use test paper or PH value tester to test the stone cleansers, the original cleanser not the thinner. 8. StabilityAs a product to be used indoors and outdoors, stability is important. The application range should between 40-60. Users can put some product in beaker, then place it in oven and refrigerator. And then get out and let it resume room temperature, check whether the appearance and smell are the same as before. 9. ManeuverabilityIt will be convenient for convenient. Some stone cleansers has strict using conditions, certain temperature, dryness, atmospheric conditions, time, which will bring inconvenience to constructor. 10. Physicochemical report by special testing departmentData provided by special testing department is needed. General test are ph value, water absorption rate, pollution cleaning rate, temperature stability and so on.