Bifen I/T

pretty much any insecticide will kill mosquitos, you just have to be persistent. no matter how long the residual lasts, killing on contact is always most effective (and satisfying).

There is a Bifen that is oil-based for exterior spraying.

Bifen I/T is water based and for interior spraying.

Spraying works......for a while. And then you will spray more, and then more, and more. Insecticide/chemical companies love that model.

Spraying to protect your immediate living area is one thing, and is generally fine. Broadcast spraying, or completely drenching everything can be counterproductive and expensive. New research is actually showing that mosquitoes can develop an immunity, or tolerance, to many insecticides. However, other insects that feed on mosquitoes in all life stages (larvae to adult) do not develop such resistance to chemicals, or at least not as quickly and readily as mosquitoes.

Spray if you have to, but what would work better in the long run is working to increase the number of birds and mosquito predating insects in your area.

I know a guy who has a vernal pool in his backyard. He designed it and he keeps it up. You would think his place would just be covered up with mosquitoes, but that isn't the case. What he does have a large number of are dragonflies, damsel flies, water bugs, and as of this year.....at least one species of frog (tadpoles). All of those feed voraciously on mosquito larvae. As a result, mosquitoes aren't much of a problem at all for him. The only thing he sprays is immediately around his home to keep ants and spiders at bay, and some diatomaceous earth for some box elder bugs this time of year.

Maybe worth the shot to change the way you look at things to get out of the cycle of perpetually dumping chemicals into the small part of the ecosystems we do control.