This is how I remove wasp nest here in TX. It's very effective and for the most part pretty safe. If you have a better way let me know.
This Picture shows pesky wasp nest.
Step 1: Items Needed for Safe Removal of Wasp Nest
Removing Wasp Nest can be tricky, but I've found that this has been the most effective.
Wet Dry Vacum cleaner. Make sure air filter is installed. Inside the vacum cleaner a cotton ball soaked in acetone can be put into canister of vacum cleaner to kill wasps once sucked into vacume clearner.
A hand pressurized sprayer with liquide pesticide. Follow and read instructions on water to pestcide mixture. The pesticide can be purchased at any local hardware store.