Unplggd offers a great little how-to for anyone hates mosquitoes (read: everyone) and is sick of buying new candles and cans of spray. All you need is some orange peel and a spent plug-in repellent you might have lying around.
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Just cut an orange rind to about the size of a refill, stick it inside your device, and plug it in. It's easy and pretty intuitive, seeing as mosquitoes are naturally averse to citrus and citrus-y essential oils. Of course, you could always go the smelly sock route. [Unplggd]
DISCUSSION
But why? What is it in the orange rind that scares the little blood suckers off? If it's the citric acid could I use citrisolve instead? Does it have to be an orange? Does it have to be heated or can we just carry a bit of orange peel? Will heating it with a lighter work just as well?