ZetaClear is touted as one of the most effective solutions for eliminating nail fungus. Nail fungus is not a bacterial or viral growth. Fungus is a microscopic plant and will thrive on moist surfaces. The skin layer under your nails is moist so this is a perfect place for fungus to grow. Once nail fungus develops, it can only grow worse especially if you will not treat it. Medical researchers have found out that the most effective and safe way to treat this condition is through the use of natural tee tree oil.