It's supposed to be for cleaning perches, cages...everything that has poop on it. It says that it "melts the poop away"...now that's what I'm talking about!!
I don't use it for chicken poop because compared to other kinds of bird poop, chicken poop is a breeze to remove. We use it in our indoor bird room for budgie poop (it's like fast drying cement) and linnie poop (if you don't get that when it's wet, you either need Poop Off or a sand blaster).
Poop Off is a great product, though, if you have very stubborn, dried poop of any kind to remove.
p.s. By the way, we're still on a 16 oz spray bottle that we got so long ago I can't remember. A little goes a long way since we only use it on things that won't come off with plain water, or vinegar/water solution. Our neighborhood Petco sells Poop Off, too.
I use the stuff for my parrots cage when I can't get it out to presure wash it. They should fine a use for bird poop. It is some tuff s--t. I think it would out last external paint for a house and stands up to all elements.