Is there a under tank heater attached to the viv? If not I would just take the tank, put it in the bathtub and scrub that thing with a sponge and some very mild dish soap, that doesn't have any added fragrances to it. Normally its standard to not disturb the snake for a few days when switching environments for it. Were you not able to hold the snake before you purchased it? How are you regulating temperatures? A picture or detailed description of your setup would help us get you on track with basic husbandry. Its incredibly important to know what all of your temps are.