How can I clean hard water scale from my Bosh dishwasher?

Use Navasol, simply pour it into the vessel that needs to be cleaned, or pump it through deposit-laden pipes. It will dissolve the hard-water scale deposits immediately. Rinse the cleaned equipment with water. However, do not use Navasol to clean hot-water heaters that contain a magnesium rod. Navasol will react with the magnesium. Also do not use Navasol on galvanized surfaces because it will dissolve the zinc coating.