Try using a pressure hose...I have a probelm with birds being attracted to my house, so every few months I use a pressure hose on the bricks, tile roof and colourbond fence....it works well!
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Get it wet. Bird poop picks up water pretty quickly, after ten minutes or so you will probably be able to wipe or spray it off. For porous surfaces I suggest letting it dry and simply vacuuming.
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What is the best way to remove dried on bird droppings from a hard surface?