Acid thickener thickens and increases the viscosity of a range of acid systems including phosphoric, sulfuric, hydrofluoric, citric, oxalic etc. It is a multifunctional material featuring effective thickening, wetting, corrosion inhibition and perfume solubilization. It is especially used in compositions such as toilet bowl cleaners, metal cleaners and brighteners, rust stain removers, denture cleansers, metal descalers, general hard surface cleaners, detergent, disinfectants and other cleaning agents.