I have two (2) bottles of partially used (practically full) cleaner called CLR. This product is terrific at cleaning up calcium deposits from glassware, tile, tea and coffee pots. It dissolves lime scale from coffee pots, humidifiers, tubs, toilets and sinks and removes rust stains from stucco, brick, porcelain, chrome and metal. It is formulated in partnership with the EPA. The label reads "Recognized for Safer Chemistry".
Both bottles are the 28oz size that sell on Amazon for $11.98/ea.