advise to pour any water or oil through it. Some people advise to pour oil through your didj every few month, but we do not advise to do so if your didj has any non-oil finish or artwork on it. The oil tends to slowly seep through the wood and lift the paint or artwork off. This might take several years, but will be a messy affair once it starts... So please do not pour any oil through our didgeridoos. Other people swear by pouring water through their didgeridoo before playing to improve the sound. This is true for didgeridoos which are unsealed on the inside. The effect is achieved by the water forming a skin over the slightly rough surface of the wood. Frequently pouring water through your didj may accelerate or cause cracking. Each one of our didgeridoos is sealed all the way through the inside. This creates a very smooth surface facilitating good sound quality. It also seals the whole inside of the didgeridoo and thus helps to prevent cracking and splitting. So if you are the proud owner of a didjshop.com didgeridoo you do not have to do anything to the inside of your didgeridoo. Possible long term maintenance If you use your didgeridoo frequently, it might develop some wear and tear around the bottom edge from abrasive contact with the ground. We advise that you get a non-yellowing varnish to cover up any exposed wood if you experience this type of wear with your didj.