Unplug the water dispenser from the electrical outlet.
Remove the water jug, and discard any water that is in the jug.
Bring a large pot of water to a boil, then pour the hot water into the water reservoir along with 1 tsp. of bleach.
Place a pair of rubber gloves on your hands if you like, then use a nylon scrub brush to clean the inside of the reservoir.
After cleaning, pour the water out into the sink, then fill once more with boiling water and let sit for 20 minutes.
Run the boiling water through the water dispensers on the machine, allowing the water to collect in the pot you used to boil the water.
Discard the water, place a fresh water bottle back onto the unit and plug into the electrical outlet. The unit is now ready for use.