Stone Pro Crystal Clean Spray is pre-mixed, neutral cleaner and works great on protector for marble, granite, travertine, limestone, slate, and all other natural stone, ceramic and 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. Crystal Clean's anti-bacterial / anti-microbial capabilities help sanitize your surfaces and inhibit growth that causes grout line discoloration.