Make Your Own...These DIY Citronella Candles will prevent you from being a mosquito blood bank! Store bought citronella candles do NOT seem to work. The scientist in me decided to research this annoying conundrum and I found the problem! They use citronella scented oil, not citronella essential oil. A quick internet search revealed that you can buy citronella essential oil for less than 4.00 So, throw out your tiki torch oil and candles and make your own DIY Citronella Candles!