In order to clean the condenser tubes properly, it is necessary first to drain the cooling water from the condenser and then disconnect the water connections and remove the condenser heads. When you remove the condenser heads, be careful not to damage the gaskets between the tube sheet and the water side of the condenser heads. Tubes should be inspected as often as practicable and be cleaned when necessary, by using any approved method. Use rubber plugs and an air or water lance when it is necessary to remove foreign deposits. Although it is essential that the tube surfaces be kept clear of particles of foreign matter, care must be taken not to destroy the thin protective coating on the inner surfaces of the tubes. When the tubes become badly corroded, they should be replaced in order to avoid the possibility of losing the R-12 charge and admitting salt water into the R-12 system.