I just found an old bottle of tea tree oil I bought awhile back. This stuff is awesome! It serves as an anti-fungal and topical antibiotic, aka a really good antibacterial cleanser.
Some people use it for fighting acne, because as an oil, it supposedly won't dry out the skin as much as alcohol based cleansers.
Tea tree oil comes from the tea tree, aka Melaleuca alternifolia, and on the negative side, it is toxic if swallowed and incredibly smelly.