Maybe it's just my imagination, but I believe my snake gives "signals" when he's fouled the cage ... notably when in one of its two hides..

Specifically, thermometers (both) are turned over, despite being velcro-fastened to the sides of the cage, the climbing branch is laying flat on the cage surface, and the "substrate" - in my case Eco-carpet - is bunched up, and the rectangular water bowl has been re-oriented. The snake, as expected, is in the opposite hide from the one that's been fouled. I can understand how no creature likes to be close to waste matter, but...am I imagining things, or is this just a normal consequence of stress or discomfort?