Forget the DEET. That's for mosquitoes, and it's not a repellent, but rather it interferes with their sense of smell so since they can't smell you (food) they don't bother you. It's also toxic.
Citronella is not a repellent of any kind. Smoke from Citronella candles is a repellent (downwind from the candle). Smoke from ANY candle is the same repellent. There have been many, many studies on this, but the legends live on.
What I use is Permethrin. This is an insecticide (meaning it's designed to kill) but works good as a repellent as well. It's a synthetic copy of a natural compound, Pyrethrin, found in marigold flowers.
It's mostly used to spray orchards. It's also used a lot in dog flea control medicines.
The stuff binds to materials, so keeps working even when dry. When sprayed onto clothing, it will continue to work for months, even after washing. The military even washes their uniforms with it.
Once dry, it is odorless, colorless, and doesn't effect the feel. Basically, you won't know it's there. It will leave a residue on glass though.
Safe for clothing & gear. I spray all my outdoor clothing and gear every spring, then need to reapply it in the fall.
You can find it in cans at REI and other outdoor stores. I buy the concentrated stuff off of Amazon, then dilute it and apply it with a garden sprayer.
I've been using this for years and am very rarely bothered by bugs.
Btw, if you spray the perimeter of your house, it's pretty good at keeping bugs out.
WARNING: While it's still liquid, this is very toxic to cats and fish. Once dry, it's safe.