Lemon or lavender is supposed to keep insects away. MayB look at soaps which you could use on your neck, arms, face? It's those insects that creep up from behind and a couple of days later, the itching begins
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'Deet' remains the best anti-bite mozzie spray - if U don't want to apply it 2 your skin then put it onto the clothing? DH puts it on his wide brimmed hat when fishing or if we go walking as well as at the bottom of his jeans to stop 🛑 insects creeping underneath!
After insect bite ointments are available, I've used TCP paste successfully.