Cleaning time is handling time. Snake comes out when you clean especially a new one that likes to hide. The animal could be in feeding mode and you don't know it because you can't see it. Once you get to know your animal you will be able to determine what mood the animal is in. Almost all of my older girls allow me to mess around in their tubs without incident if I have to, but even these I will touch to let them know it is not time to eat. Generally like I said before though, cleaning time is handling time. I usually take the time to do a little enrichment. Tub is opened and around my neck they go until I am done doing what I have to do. A few will even come out on their own and climb up my arm. Repetition and schedule is the key to training behaviors into these guys. Even my nicest girl would go after my hand on feeding night if I stuck it in her tub unannounced because they smell rat, the lights are down and it is Saturday. After feeding lights go back on and I will up any rat mess. They come out of feeding mode as soon as the lights go back on because this is the pattern that has been followed for years.