Metal sculptures, whether polished or coated, are prone to discoloration over time due to environmental factors like humidity, pollution, and UV exposure. To preserve their aesthetic appeal, follow these proven methods:

1. Regular Cleaning: Use a soft cloth and mild detergent to remove dirt and grime. Avoid abrasive cleaners that can damage the surface.

2. Protective Coatings: Apply wax or clear lacquer to create a barrier against moisture and oxidation. Reapply periodically for long-term protection.

3. Climate Control: Store or display sculptures in stable environments with low humidity and minimal temperature fluctuations to reduce oxidation risks.

4. UV Protection: Keep sculptures away from direct sunlight or use UV-resistant coatings to prevent fading and discoloration.

5. Avoid Harsh Chemicals: Exposure to acids, salts, or pollutants can accelerate discoloration. Rinse sculptures promptly if exposed.

By implementing these strategies, you can significantly extend the lifespan and beauty of your metal sculptures.