"Deet" 100% is supposed to be the best (but only for Adults). It can be bought at camping supply stores, or the likes of Dunham's. The little bugger's love to go to the top of your body, that of coarse being your head. But they don't seem to notice it's actually your head, just going to the top of the body. We used to raise our hand in the air when encountering a large group of them. And they always circle around the hand. This results in a sore arm after awhile, but helps for the short term.
Again 100% Deet can be bought in a small, 2 to 4oz container. You'll also notice that it's the main ingredient for sprays like "OFF".
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