A Complete Guide to Using Eucalyptus Oil at Home From freshening the air to cleaning surfaces, creating a calming atmosphere and adding that unmistakable Australian scent to your home, eucalyptus oil is one of the most versatile essential oils around. There is something wonderfully familiar about eucalyptus. It is part of the Australian landscape, woven into our memories of bushland, fresh air and that unmistakably clean, invigorating scent. But eucalyptus oil is more than a beautiful aroma.