Sulphamic acid is used as an acidic cleaning agent, typically for metals and ceramics. It is a replacement for hydrochloric acid for the removal of rust. In households, it is often found as a descaling agent in detergents, cleaners, and toilet cleaners for the removal of limescale. It is valued for its low toxicity and ease of handling compared to stronger acids. Sulphamic acid is also used in industrial processes for pickling and passivation of stainless steel. Its versatility and efficiency make it a preferred choice in both domestic and industrial cleaning applications.