We had a mite infestation at our home last month and I used tea tree oil for everything. I used it for laundry, I sprayed it on the mattress and on the carpet. It worked really well. The mites were gone in less than a week and we didn't have to move to a new apartment.
I'm continuing to use it diluted with water around the house for maintenance. My husband travels a lot for work and I don't want another infestation.