The amount of trees and the bird droppings destroying my vehicle

It is costing me 30 pounds were week having my car washed nearly every day due to my car being absolutely covered with bird droppings. I went out yesterday and my door handle was full of poo.. had to climb in the passenger side.. the bird poo is corroding the paint on my car and is going to cost thousands to repair... my car is on finance.. I'm not even half way through paying for it and it's destroyed already! I'm going through gallons of screen wash a month.. I cannot afford this onto of paying for my car.. something needs to be done..