I gave up on anything but DEET years ago. If they’re real bad though even that sometimes isn’t enough. That’s face net and baggy full body clothing time.

Does vary by mosquito species but yeah for the most part.

Alpine mosquitoes with shorter seasons tend to have swarming strategy, they’re loud and you notice when they land on you. It’s just that there’s about 1-200 of them flying about you so lots will still be successful. These ones mostly don’t spread disease but they ruin a hike.

The sneakiest ones are in the tropics and are the species that spread malaria and other disease.