Things You'll Need
Instructions
Clean the helmet by soaking it in liquid soap mixed with water. Remove any leather parts before soaking the metal portion of the helmet.
Place the helmet on a cotton cloth. Look for any insignia, such as the hammer and sickle or a Russian bear, on the helmet. Spray the helmet with limescale remover. Do not apply the spray to any appliques or other insignia that you do not want to clean off.
Rinse the limescale remover off with water. Clean the helmet with your cloth and the large and fine brush, depending on how set the dirt is. Be careful around areas that still have original paint so that you don't scrape it off.
Blow dry the metal parts of the helmet. However, if any leather got wet during the cleaning process, set it out to dry in the air.
Cover the metal parts of the helmet with petroleum jelly when it is dry. Afterward, spray on rustproof paint where needed.