Citronella is one of the species of Cymbopogon types. It is mainly used in cosmetic products like soap, deodorants, etcâ?¦ The Java type of this oil is said to be better for perfumery than Ceylon type. It is also used as a repellent for some insects like mosquitoes, body lice, leeches, and stable flies, etc. It is one of the most commonly used oils in aromatherapy as it helps in relieving headaches and fever.