Zep Concentrated Calcium, Lime & Rust Remover is a professional-grade acidic cleaner formulated to dissolve tough mineral deposits fast. This heavy-duty rust and limescale remover breaks down calcium buildup, lime scale, and rust stains on contact, restoring surfaces in bathrooms and kitchens. Ideal for porcelain, glass, tile, and fiberglass, it delivers powerful results on tubs, sinks, toilets, and shower fixtures.