NOW® Essential Oils' 100% Pure Eucalyptus oil is popular in topical, cleaning and aromatherapy uses. Try it with citronella, lemon and tea tree oils in a DIY outdoor spray. Combine with bergamot and tangerine oils for an energizing aromatherapy blend. Add it to a mix of vinegar, water and dish soap for a squeaky clean and great smelling house. Steam distilled from leaves and small branches.