Too Clean?
Mmmmmmmmmm....(Scratches bald head)
In the wild these things **POOP** and move on.(We could learn a lot from them)
In captivity they **POOP** and move about 3 feet, 4 if they are lucky! Imagine hanging out 4 ft from your own poop? 
I *Totally* respect your theory but I have a theory of my own:
THE BIG GIANT CAGE THEORY (tm)
I believe that we keep them in cages that are TOO SMALL. I think that a minimum size cage for an adult Eastern Indigo should be 16 feet in length, with a width of at least 8 feet, and a height of 5 feet! And even BIGGER outdoor enclosure should be used for breeding pairs.
With a special subterranian ***pooping chamber***, pre scented with urates so that it will be used. And a false bottem so that it can be cleaned out easily.(Ewwww)
With cages this large we could just hose them out, into a drain. Thereby saving the use of hundreds of rolls of paper towel and lessening deforestation!!
see....I am thinking conservation...on a huge scale!!
But I still think, that no matter how much we cleaned them, they would just drop a load as s on as we are done..
ITS SHEER SPITE I TELL YOU!
Dont believe me? Clean your Drys cage and drop em' in and set the TIMER. If they dont poop in 30 minutes to an hour,Ill grow hair! :*)
Sincerely,
Fred Albury