Tea Tree essential oil was the very 1st I added when learning to make soap. My father and sister-in-law love it and keep asking me to make more. LOL I use a considerable amount. Since it is added right before pouring into molds (CP)...it is distributed well into all the oils being sopanified. And like mentioned earlier....is already safe for direct skin contact (cuts, abrasions, infections, bites, etc).
It's great for people with acne, scalp conditions or those of us who just LOVE it period. LOL
I have mixed it with Eucalyptus EO before, in soap. It was very refreshing. And felt good on my itchy, flaky scalp.
I always keep a basic castile soap with lots of TT in it, in our van's first aid kit, along with the original EO and other essentials.
We have also been using my homemade hard bar soap with a lot of TT in it...for washing clothes. I use a pampered shef cheese grater (that holds the soap in place and turns) and shred it over the load. Doesn't take much at all to wash well. The TT is especially good for laundry because it's a broad spectrum antibacterial. It is the only safe, non-toxic, natural liquid that can be used to kill not just staph....but in some cases the MRSA strain of staph! Since bleach is toxic on your skin, to breathe or ingest...TT the best!