Oxalic acid (H2C2O4) is a versatile organic acid widely used in cleaning and bleaching applications. It is commonly used to remove rust, ink, and mineral stains from metals, wood, and fabrics, and serves as a bleaching agent in the textile and paper industries. Oxalic acid is also used in metal cleaning and polishing, leather processing, and as a reagent in laboratories for analytical and chemical preparation purposes. Additionally, it is employed in some pharmaceutical and industrial processes because of its strong acidic and reducing properties.