Apple cider vinegar is an effective and mosquito repellent teen base that can be used to increase the repellent potential of certain essential oils. Chris, thanks very much. While citronellal is believed to show a little repellency against mosquitoes, PMD is highly effective against these tiny creatures 12. All those insect sprays you buy kill the bugs and have loads of harmful chemicals, and I was wondering if there was a way to make insect repellent for a room rather mosquito repellent teen a person. So, Lemon Eucalyptus it is!