Stone Pro Crystal Clean is a highly concentrated, neutral cleaner and protector for marble, granite, travertine, limestone, slate, all other natural stone, ceramic tile, porcelain tile, and grout. This is the single-most important product you can use to keep your stone and tile surfaces in top condition, and should be the cornerstone of your routine cleaning practices.Crystal Clean is strong enough for commercial use, yet safe for the home. Its powerful cleaning agents are highly effective on dirt and grime, and it leaves an invisible, streak-free protective shield against soil and staining. Crystal Clean does not contain acids or alkalines that can damage your stone, or chelates that can leave your surfaces looking dull and lifeless. It is a perfect -7 pH neutral cleaner that will not damage or change the appearance of your surfaces, even with daily use.Crystal Clean contains two evaporating agents that make it dry three times faster than plain water or other stone cleaners. When used with the damp mopping technique, Crystal Clean will drastically reduce water induced fill loss and spalling in travertine, limestone, and marble, and microbial growth in pits and grout lines.