"Everything" would, in theory, include something that worked, so it would help if you could tell us more about them and what you actually did try.
Yellowjackets (paper wasps) can be aggressive and their stings hurt (ask me how I know!) so if I were dealing with them I'd probably put some kind of soap (orange oil, etc.) in a hose end sprayer and spray down with a fair amount of pressure (from a safe distance) until the nest is either knocked down or soaked so it can't be lived in. And you may have to come back and do this several times. I had some of these wasps on my front porch and I knocked down the nest many times before they finally gave up.
I didn't let the nest get very big, but I also had long things like brooms or the handle for my limb saw to poke the nests down from several feet away. Even then, be prepared to drop the pole and scoot out of the way.
An interesting note: when the wasps are nesting in areas that don't harm people they are beneficial. I've knocked down nests. I also have mud daubers, (
http://www.dirtdoctor.com/organic/garden/view_question/id/743/) that are crammed full of dried spiders. If you'll look at Howard's
Texas Bug Book you'll see the story of Malcolm Beck finding mud dauber nests full of black widow spiders.
As mentioned above, Paper Wasps are often called yellowjackets, and here is the dirt doctor entry about them:
http://www.dirtdoctor.com/organic/garden/view_question/id/3516/This answer is talking about wasps that are colloquially called "yellowjackets." There are hornets that live in the ground called Texas Yellow jackets (see the bottom of the Paper Wasp entry). Spray with orange oil to kill the nest.