Damage to Roofs:
Bird droppings are very acidic in nature. They actually eat away at many substrates, especially tar-based roofing materials. Droppings which are allowed to accumulate on roofs will eat into the material and eventually cause leaks. The life expectancy of a warehouse roof can be cut in half by just a light, but continuous, application of bird droppings.

Pigeon, starling and sparrow nests are often built in rain gutters, drains and corners of roofs where drains are located. Several warehouses every year experience great damage, even collapsed roofs, when drainage systems are blocked and standing water is allowed to rise just six inches. A collapsed roof that resulted in death or great physical damage could put a company out of business
Damage to Vehicles:
Acidic droppings can destroy a vehicle's paint finish very quickly. Just ask the bank who had to re-paint a customer's new BMW.
Dangers to People: Staff, Students, or Visitors may slip and fall if droppings aren't removed and the bird problem resolved. Are YOU willing to accept the Liability?

This is a city park pavillion before clean up. Would you let your children eat or play in this pavillion infested with pigeons, droppings, and nests?