As a wood object a Didgeridoo is sensitive to thermic and hydrometric shock, so avoid any extreme environment like prolonged full sun exposure, hot car, prolonged exposure to very dry or wet environment. To protect and nourish the wood, we applied a wax based protective finish on the outside of the Didgeridoo and a linseed oil coating in the inside. It is a good idea to apply more linseed oil to the inside every year. Place the Didgeridoo in one of the containers with the mouth piece facing up, pour the oil in it and repeat the operation three or four times. Let all the oil drain out for a few hours and your Didge will be a happy Didge.
Linseed oil prevents bees wax from adhering to the wood, so keep the mouth piece area free from oil.
The outside finish is waterproof and doesn't need any special care. The mouthpiece is really important for the full enjoyment of your Didgeridoo. The first two can be adjusted using simple woodworking techniques. Soften the wax in direct sunlight or under a lamp. Take out a plum sized lump and roll it between the palms of your hands forming it into a doughnut the length of the diameter of your didge.