I now have 69 trips around the sun if pigeon dropping were going to kill some one I should be at the top of the list or better yet in the ground. Removing the pigeon dropping plays a factor in your well being possibly. I employ 2 tarps that I exchange once one is soiled. The soiled one I leave in the sun to bake and dry and scrape with the back side of an iron garden rack. Plus I use nylon mesh feed bags to line my nest boxes which have the same properties as the tarp and if anything clean even easier.Pigeon people what's the truth about pigeon droppings.