If you go to Walmart they have straight tea tree oil for about 5$ you need to add it to the shampoo.I have used the oil straight from the bottle. You need to leave either the oil or shampoo on for at least 15 minutes.My granddaughter has waist length hair. I think the last time we used from the bottle it took 3 bottles.The oil in the shampoo is not strong enough to have it work.Wash everything if you can’t wash it put it in a plastic bag for two weeks.Most dollar stores around here carry the shampoo and I just add about a half bottle of the oil.
When I couldn’t find the shampoo I put a whole bottle in baby shampoo. Alcohol will also work but it is bad for the hair if you have to use it to many times. Sue