@fdixon63 What I have done for sinus infections is to use a vaporizer and inhale steam that contains oil of oregano. I saw that on Dr. Oz and
I have a face mask on a heating vessel from a pharmacy and I put a few drops of the oil in there. I also have just held the eye dropper under my nose and let steam waft past it. Be careful about inhaling steam that is too hot and being too close to the source and the vapors of the oil burn, so close your eyes. You probably could do the same with tea tree oil, but I haven't tried it.

What I also do for a sinus issue (aside from saline rinsing) is to use Bactroban (generic Mupiroicin) ointment directly in my nostrils. This was something my Mayo surgeon had me do before surgery to treat a potential staff infection as a precaution. I've had sinus issues that seem to progress to my chest, and I've treated them like this and it works, so my primary doctor gave me a prescription for the ointment. Before my surgery, I was to use a pea sized glob in each nostril 2 x day for 10 days. When you get it up high enough, it spreads out and you taste it, and it makes my nose run, so I tend to do this before I lay down at night. I usually treat for about 4 to 5 days for sinus issues and that is enough. Controlling the phlegm from allergies goes a long way in preventing respiratory infections.