Use caution with acids and acidic pH products as they attack the polish on marnbles and limestone. Phosphoric acid, citric acid and sulfamoc acid is preferred to muriatic, sulphuric and hydrocloric acids in almost all situations due to safety and control issues. Abrasives are sometimes useful as a cleaning agent but should be limited to non-polished surfaces. Abrasives may be combined with detergents or soaps for scouring a surface and removing thin layers from the surface. There are many different types of materials used as abrasives - soft abrasives may be composed of nut shells or feldspars, hard abrasives can be silica quartz, carbide or even diamond.
Enzyme types are available which are non-hazardous.
This type also darkens many types of stone surfaces. Water based silicone derivative useful for light colored, porous stone. This type should not be used on dark colored stone or important surfaces. Any residues not absorbed will disfigure surface with a salt-like precipitate. May be useful for some limestone and concrete surfaces.