If you've got water deposits from chalk, use vinegar to scrub it with. Plenty of elbow grease and lots of rinsing after.Baby-bottle solution can be used to kill any bacteria, then plenty of rinsing again. You'll need an escape-proof lid, like a screen, so the snake can't escape. You'll need a heatmat that will cover 1/3 of the floor space, regulated with a thermostat. Plus a digital thermometer to measure the temperatures.
Ideally you'll set it up and monitor the temps for a few days before getting the snake