Bird and Bat droppings carry over 60 different types of diseases. Here's a link for clean-up. Never sweep it dry, you'll cause the spores to go airborne for inhalation. This goes for rats and mice droppings as well as their dried urine. I just recently had to give a class to my employees since we have such an infestation of Starlings in our hangar and helicopters. It pays to take precaution with this nasty stuff !! Also, certain chemicals react to the droppings and make it far worse.
http://ehs.uconn.edu/Biological/Removal and cleanup of bird and bat droppings.pdf
http://ehs.uconn.edu/Biological/Removal and cleanup of bird and bat droppings.pdf