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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 Oil as a Mosquito Repellent. For over 60 years now, the oil of Citronella is being used as an insect repellent. The odor of the oil makes it tough for mosquitoes and other insects to locate the host, thus, protecting humans. Also, no side effects of this oil have been reported.