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. 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. 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. It will drastically reduce water induced fill loss and spalling in travertine, limestone, and marble, and microbial growth in pits and grout lines.