The primary active ingredient in Klean Strip Phosphoric Prep and Etch (GKPA30220) is phosphoric acid. The solution also contains: * **Water** (the primary carrier/solvent) * **Isopropyl Alcohol** (less than 1%) * **Ethoxylated Alcohols** (a surfactant, less than 1%) **Important Safety Note:** This product is corrosive and can cause severe skin burns and eye damage. Always wear protective gloves, clothing, and eye protection during use.