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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..
Citronella candles and sprays are the first to come out in summer months when bugs get bad. For ticks, though, citronella may not be the first go-to. In a 2014 study of the effect two oils â citronella and clove â have on ticks, clove came out on top.