Unfortunately, paint is susceptible to many types of material that can ruin its finish, such as bird droppings, bugs and gasoline. Paint needs to be washed and waxed in order to be constantly protected from the elements.
It is important to keep the car waxed to avoid sunspots and damage from other materials. Listed below are several things that can ruin an automobile's paint if not quickly washed off.
Bird droppings - Bird droppings are acidic and sometimes contain obscure objects such as gravel. They can also scratch the paint.
Bugs - Bugs are also acidic. Driving a car into a swarm can etch its paint.
Gasoline - Gasoline will leave streaks on the paint that are very hard to remove. Eventually, the fuel will begin to tear down the clear coat and other layers of paint.