Just like us, birds need fresh water to quench their thirst. But a dirty birdbath can be a breeding ground for diseases and bacteria that can harm our feathered friends. Be sure to disinfect the birdbath every month by using a combination of nine parts water to one part bleach. For a wooden bird feeder, just use three parts water to one part white vinegar to scrub them clean. Also be sure to change the water and food frequently and sweep up any droppings on the ground.