Before cleaning iron objects, consider first their original condition. Bright metal finishes, the result of recent polishing, or painting, may affect the value of your iron keepsake. Protect iron objects in good condition from high humidity, fingerprints, salts, and acids. A 40 percent relative humidity level is suggested. Iron is the metal most susceptible to corrosion.
Corrosion usually occurs slowly.
Unless it is necessary to remove the surface layer of corrosion, the item may be best left alone to retain its value as a keepsake. Over-cleaning cannot be undone. Remove dirt, grease, and moisture from the surface. Vacuum the item to remove dirt. If the condition of the finish is so bad it cannot be saved, fine bronze wool or very fine emery cloth can be used.