Tea tree is also useful for many other things and is a good oil to have around the house.
Here is how to use tea tree oil for a cold, sinus issue or sore throat.
Heat up some water in a pot on the stove until it starts steaming. The water should not be boiling. Add a few drops of tea tree essential oil. Put a towel over your head to help contain the steam and inhale the vapors for several minutes.