Two powerful (and safe) ingredients are all you need to kill the fungus that creates mold: white vinegar and tea tree oil. The solution is a cinch to make. All you need to do is fill a spray bottle with white vinegar and add a teaspoon of tea tree oil. Spray the moldy area, let it sit and wipe away the mess with a microfiber towel. The mixture is an all-natural alternative to chlorine bleach.