Sulfamic acid also known as amido sulfuric acid appears as a white crystalline solid which is non-hygroscopic and stable.  It is soluble in formamide and water and slightly soluble in concentrated sulfuric acid, methanol, acetone, and ether. is a super-efficient descaling agent used for cleaning a number of domestic appliances and industrial equipment.  it is used as an acidic cleaning agent usually for ceramics and metals.