GT-1 Green Thing is a EPA certified "Green" cleaner. It is pH neutral and ready to use. GT-1 Green Thing is formulated to safely and easily clean honed and polished marble, limestone, travertine, granite, slate, ceramic, porcelain tiles, corian laminate as well as painted wall surfaces. It also works great on mirrors, windows, and high shine metal fixtures. It does it all! GT-1 Green Thing dries quickly leaving a streak free surface. It is created to be environmentally compatible and sustainable. This no rinse, fast evaporating, powerful, daily cleaner works effectively to cut through soils on all hard surfaces at home and work.