|Blue Spruce Eco-Friendly Cleaning Company - Minneapolis, MN|
I've been looking around for a good nontoxic stone cleaner to use in stone shower stalls. Most that are out there are not nontoxic. Simple Green makes a stone cleaner with biodegradable ingredients and zero VOCs (volatile organic compounds--these give off gases as they work). And it works moderately well. The only draw back is that it has an irritating smell. This is the best that I've found.