On my new black Honda that I park outside on the street, I am getting a green substance stuck to all my water troughs and around my trunk where the water drains off the car and around window mouldings and cowling.When I wiped the bird poop off the roof with a wet cloth the cloth turned green, so I am wondering if it could be a pollen from the neighbors large cedar tree. If it is pollen what is the best way to get rid of it as it is in most nooks and crannies especially the sunroof.