Your thread stirs a couple old memories with me. I guess when your a sign service person, you're always gonna run into and have to deal with pigeons. There was this one job in particular where we were servicing a large plaza. The job was extensive and was not only changing out all the lamps and ballasts in their extremely large pylon sign, it also included power washing the entire building (along with the sign).
Well, this pylon was unbelievable. There had to have been 200 pounds of pigeon crap on this thing. There was no way we could wash that much infectious crap onto the street. We ended up turning down the "clean up" portion of the job. We did service the electrical part using disposable poncho's, respirators and rain hats, with dozens of pigeons perched all around us (CREEPY how they get used to you being there, and don't move). As for the "Crap", they had a HazMat group do the clean up. I wish I had pictures.!!!
One of my mothers best friends lived on a farm. Her son had contracted a form of yeast infection from the pigeons in the barn. He started having breathing problems, and neurological problems. The disease progressed and he eventually went completely blind and slipped into a coma and died. He was only 16 years old.
To be honest, I refused the "clean-up" part of that job, because I was scared of catching the same disease. To this day, I can't stand to be around any birds.