CleanStone by Bott and Sons Save Liquid error (product-badge line 32): Computation results in '-Infinity'% $13.50 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Bott and Sons CleanStone is an expanded glass brick made to clean and remove hardwater staining from monuments Made to clean & remove hardwater from monuments Easy to use and will not damage the stone