I usually figure that when I clean a cage or water bowl, I will be recleaning it at least one more time with in 24 hours! My younger snakes all seem to dump right after I change the water, while the older ones don't do that. Of course, the younger ones feed more often, so they have more to process (relative to their size).
"To truly rescue an animal one has to provide long-term care that guarantees the animal's security for its natural life, because rescuing is more than removing an animal from a bad situation. Rescue involves restoring and preserving the animal's dignity for its natural life without stress, and this includes conserving the species as a whole for generations to come." (Brian Werner, founder TMLF / TCWR)