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One chemical repellant I would NOT be using is DEET or any repellant with DEET in it. I read an interesting article recently (can't remember where but it was a reputable site) about how by swabbing a smart phone screen the owner could be identified by the chemical smear from their hands left behind on the screen. One of the associated findings was that DEET could be detected four months after the last use by the owner! That suggests to me that it is absorbed into the skin and remains around for very long periods. Sounds like something to avoid to me.
Ian
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