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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..
As well, the candles produce large particles in their smoke and there have been concerns about how safe it is to regularly breathe in this smoke. Mosquito coils: Like citronella candles, mosquito coils produce a smoke that confuses mosquitoes. The coils contain the insecticide allethrin.