Roundup. Just be very direct in your approach or you'll have horrid dead spots all over the yard. My wife used it in a larger sprayer rather nondiscriminatory last year to kill a bunch of pear tree sprouts. There are still huge 12" and larger circles of dead grass where she sprayed. I'd been using a small bottle with a very directed spray and you can't tell where I killed 'em off. Of course I hate yard work, especially mowing, and would just spray and kill the whole yard but you have to have something holding the topsoil in place.... Dandelions. I hate them... Die, die, die you horrid dandelions.
Marigolds. Put 'em in pots and distribute around your attraction areas. After trying several solutions she'd gotten from Pinterest (am I the only one who thinks there are some truly hair-brained ideas there?) my wife finally listened and put a few around the porch. Problem solved. Of course I don't like the smell either but I'd rather have them than mosquitoes getting sucked into the house every time the door is opened. I've read that basil plants work better, and can also be grown in pots, but haven't yet tried it. Side benefit - fresh basil for cooking.I don't think you can ever get rid of mosquitoes. I had these awful shrubs my grandparents had planted...