Personally, I think there's nothing wrong with just letting the snake go when it wants to go. They don't really need "help" in that department. However...if you're about to go out on vacation for a few days or maybe you have company coming over in a couple days and don't want to risk a poorly-timed stinky surprise....it's a fine idea to give them a little soak and see if they'll clean out in a more convenient time.