Outdoor metal sculptures are vulnerable to damage from bird droppings, which can corrode surfaces and degrade finishes over time. To protect these artworks, consider these effective methods:

1. Protective Coatings: Apply a high-quality wax or clear sealant to create a barrier against acidic bird droppings. Reapply every few months for lasting protection.

2. Bird Deterrents: Install spikes, nets, or ultrasonic devices near sculptures to discourage birds from perching. Reflective tapes or decoy predators like owls can also be effective.

3. Regular Cleaning: Gently wash sculptures with mild soap and water to remove droppings before they cause permanent damage. Avoid abrasive tools that could scratch the metal.

4. Strategic Placement: Position sculptures away from trees, ledges, or other structures where birds frequently roost.

5. Alternative Perches: Provide designated bird perches or feeders away from sculptures to divert their attention.

By combining these methods, you can preserve the beauty and longevity of your outdoor metal sculptures while minimizing maintenance efforts.