The Works Rust, Lime & Calcium Remover is great for removing tough hard water stains from many surfaces. Instantly removes rust and mineral deposits from dishwashers, washing machines, humidifiers, pots and pans, coffee makers, shower heads, cement, brick, vinyl siding, fiberglass, PVC, lawn furniture and more. Removes on contact! Made in the USA. Net wt 13.5oz. 12 bottles per case.