Black Diamond Marble & Tile Cleaner contains special cleaning agents that lift dirt from the pores of the stone without damaging the surface or diminishing natural color. This biodegradable formula is safe for natural stone and tile surfaces and is gentle enough to be used everyday. It is easy to use and no rinsing is necessary. PH Neutral Biodegradable Safe for Use on Granite Marble Limestone Travertine and all other types of natural stone surfaces. 32oz Concentrated Bottle.