Carbon Destroyer XX is the double concentrated BIG BROTHER to the already EXTREMELY tough and powerful Carbon Destroyer. This is the formula you want to use to remove ither the REALLY hard, heavily crusted carbon coated metal, OR if you need to remove nasty grease like Cosmoline, OR what you might want to use in your Ultra-Sonic cleaners to get a lower per once cost value. Carbon Destroyer XX™ is an aerospace certified, water-based penetrating solvent that cleans above and below the surface, deep into the microscopic gaps of the substrate. It is what is called a “micro-emulsion” (a proprietary blend of water & oil) and has true “Carbon Blasting” power.