Outdoor bronze sculptures are vulnerable to damage from bird droppings, which can corrode the metal and tarnish its appearance over time. To preserve these artworks, consider the following effective methods:

1. Protective Coatings: Apply a high-quality wax or lacquer specifically designed for bronze. These coatings create a barrier that prevents droppings from directly contacting the metal, making cleanup easier.

2. Bird Deterrents: Install physical deterrents like spikes, nets, or motion-activated sprinklers near the sculpture. Reflective tapes or decoys of predators (e.g., owls) can also discourage birds from perching.

3. Regular Cleaning: Gently clean the sculpture weekly with a soft cloth and mild soapy water to remove droppings before they cause lasting damage. Avoid abrasive tools that could scratch the surface.

4. Strategic Placement: If possible, position the sculpture away from trees, ledges, or other structures where birds frequently roost. Open areas with fewer perching spots reduce the risk of droppings.

5. Professional Maintenance: Schedule annual inspections and maintenance with a conservator to address any early signs of corrosion or coating wear.

By combining these methods, you can significantly reduce the impact of bird droppings and keep your bronze sculptures looking pristine for years to come.