5th Avenue is a Very Safe Neutral Cleaner with a Neutral PH of 7, allowing you to clean any exotic surface without worry. Great for Marble, Terrazo, Travertine, Granite and many more. It is safe on any surface you can put water on. Fresh Scent also deodorizes as you clean! One Gallon, Dilluted it makes 32 gallons of cleaning product at 4oz per gallon dilution. End cost of Diluted Product is $1.14 per gallon! Where can you buy a Marble Cleaner for that price?