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Best Answer: Yes citronella candles work, but their effectiveness decreases with the age. Oil of Citronella is a volatile, liquid oil derived from dried cultivated grasses. It works by repelling animals and insects without harming or killing them. It has a distinctive odour, which repels certain animals..
Making Citronella Deterrent. Although you can use a commercial citronella-based dog deterrent, you can save money by making your own. Simply fill a spray bottle with water and add just enough citronella oil so you can smell it. Shake it before each use and you're good to go.