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DEET is the most powerful repellent, but repeated, regular use is very bad for your skin. Like cancer causing bad.
I personally use Citrepel because its more natural and less toxic, but if I was in the jungle in peak insect season, you better believe im wearing DEET.
Also 100% DEET melts plastics, so remember to clean your skin before sleep unless you want your bag and sleeping mat to melt