How do manufacturers test the resistance of outdoor furniture to bird droppings and tree sap?

Manufacturers rigorously test outdoor furniture to ensure it withstands environmental challenges like bird droppings and tree sap. Common methods include accelerated weathering tests, where furniture is exposed to simulated bird droppings (acidic solutions) and synthetic tree sap to mimic long-term exposure. Additionally, real-world field testing in diverse climates helps evaluate performance. Materials like powder-coated metals, UV-resistant plastics, and treated woods are often tested for ease of cleaning and resistance to staining or corrosion. These tests ensure furniture remains durable and aesthetically pleasing despite harsh outdoor conditions.