The concerns are staining from body oils, soap residues and contaminants from many sources. Your spec should begin with a protective treatment that can offer more than just water repellency. Stand Off® SLX100 delivers the most effective water and stain protection for natural stone and tile. SLX100 penetrates even polished granite without color change. When specified in concert with Stand Off® Rinseless Cleaner, you provide your client the ultimate maintenance system. This "team" will keep all granite surfaces looking like the day they were installed.