It is environmentally safe and friendly and a very economical product to replace traditional corrosive bathroom cleaners. It is for use on all bathroom and toilet bowl areas to remove various soils from calcium deposits, soap scum, body oil, rust stains and other soils. When diluted at 15:1, this product works wonders in dissolving calcium deposits and grime build up. Use daily at ready to use level to leave sparkling clean surfaces. Note: Do not use on natural marble, granite, or natural stone surfaces. Do not use on aluminum or brass surfaces. It is safe for use on most stainless steel, chrome, ceramic tiles and other hard metal surfaces.