Sterosol, 5 Gallon, Milkstone Remover & Acid Rinse, Removes Milkstone From Bulk Tanks, Pipeline Cleaners, Pipeline, Milking Machines, Utensils, & Other Dairy Equipment, Contains Phosphoric Acid With Non-Foaming Wetting Agents For Fast Penetration Of Milkstone & Hard Water Deposits, Easy On Metals & Glassware.