Bronze sculptures, especially those displayed outdoors, are vulnerable to biological growth such as algae, mold, and lichen. These organisms not only mar the appearance but can also cause long-term damage. Here are the most effective ways to prevent biological growth on bronze sculptures:

1. Regular Cleaning: Use a soft brush and mild detergent to remove dirt and organic debris. Avoid harsh chemicals that can strip the patina.

2. Protective Coatings: Apply wax or specialized sealants to create a barrier against moisture and biological contaminants.

3. Environmental Control: Position sculptures in well-ventilated areas with limited shade to reduce humidity and dampness.

4. Anti-Fungal Treatments: Use non-toxic, bronze-safe fungicides to inhibit microbial growth without harming the metal.

5. Routine Inspections: Check for early signs of biological growth and address them promptly to prevent spreading.

By combining these methods, you can preserve the beauty and integrity of bronze sculptures for generations.