Jelmar CLR Pro patented calcium, lime, and rust remover for cleaning multiple surfaces including stainless steel, glass, fiberglass, ceramic, porcelain, chrome, cement, stucco, brick and more. Powerful non-toxic formulation effective on hardest of lime and calcium buildup. Great for cleaning coffee pots, coffee makers, commercial washing machines, dishwashers, vinyl siding, sinks, toilets, humidifiers and filters, hard water stains; for use with pressure washers. Safe for plumbing; safe for use on light-colored grout; septic safe; biodegradable; not harmful to nearby grass, shrubs, or vegetation. EPA's DfE formula for safer chemistry; USDA Certified Biobased Product, 80 percent. Multi-Use in lodging, manufacturing, entertainment, government and hospitality areas. 1 gallon bottle.