Alconox 1801 Citranox Liquid Acid Cleaner and Detergent, 1 Gallon Bottle (Case of 4) Phosphate free, concentrated cleaner and metal brightener for high performance removal of metal oxides, scale, salts and inorganic residues in manual and ultrasonic cleaning Corrosion inhibited and free rinsing for reliable results and no interfering residues Ideal for trace metal analysis USDA authorized Dilute 2:100, pH 2.5