Marble Railing

U.S. building codes mandate that balusters have no more than a 4 inch (10.16 cm) gap between them. This relatively tight amount of spacing still allows for visibility between spindles, but also stands as a safety measure to prevent small children from becoming stuck between spindles or from slipping through the balusters.

Wet the stone balustrades with clear water first. This is very important so you do not etch the surface of the stone. Apply acid solution and let sit for a minute. Rub stubborn stains with a soft brush.

Yes, you can use Vinegar solution for cleaning natural stone made balustrades and railing surfaces. Most siliceous stone - granite, limestone, travertine, sandstone, slate and quartzite - manufacturers recommend using vinegar to clean and maintain your stone surfaces. 

Found lining many staircases and terraces, a balustrade is a row of small columns topped by a rail.

A balustrade can be made from virtually any stone material, which can be carved: Granite, Marble, Limestone, Travertine, Onyx, Sandstone, Limestone, Tuff Stone, Andesite and more.