The best repellent I've found is one you make for yourself and drink.
It goes back to when Britain was fighting in India, back in the 1860's... the enlisted men were falling victim to malaria, the officers were not. Someone decided to look into why, for some reason, back in the 1970's, and actually found the answer.
The officers were in the habit of quaffing a gin'n'tonic with a citrus twist, once a day at tea, the enlisted men were not. It was the one big difference that no one gave any thought to: it was the drink that was keeping the officers unbitten.
"Real" tonic water is flavored with quinidine; the malaria drug used to treat the illness is quinine. Both are sourced from the bark of a tree, one is derived from the other. That bite that tonic has is from this ingredient, ergo why it has to be "real" tonic water and not artificially flavored.
I haven't encountered to many of anything that cares for juniper, and that's what gin is made from.
We all know citronella candles and lemon smells are a deterrent to the flying nuisances.
So it was an experiment: I don't like gin'n'tonic, but for the sake of the experiment, I agreed to drink one a day, before dinner, and my partner didn't drink any at all.
He was bug fodder, I was unscathed.
Something in that combination does something to the "scent" and "taste" of our blood, and the mosquitoes and other flying pests do NOT like it.
They do, however, really like folks that eat bananas.