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.