Just add 1/2 ounce of car soap to a gallon of warm water and also fill a spray bottle from the solution. Pre soak the bird droppings with the spray bottle then pull a microfiber out of the warm soapy water and lay it on top of the bird droppings. When it softens , wipe off. Go back over the spot with a clean soapy microfiber and dry, No need to rinse