Each month Wired’s chemist Dr John Emsley, author of nine books and 110 research papers, deconstructs an everyday product. This month: Cillit Bang cleaner. Sulfamic acid (chemical formula HSO2NH2) Included in Cillit Bang because it’s good at cleaning metals and dissolving limescale. Sulfamic acid is used on a large scale by industry for these same reasons, but more importantly it is involved in...