"No more wasps" works fine if you do it properly. Carbaryl works even better, see if you can find it in the garden department at your local store cos its not meant to be used for wasps. Find the entry to the nest, easy on a foggy or dewy morning, then sprinkle around the entrance. The wasps will walk it in and kill the whole nest, not just the active ones. If you cant get close enough to the nest, the 5ft piece of hose is the answer, push it in to the "No more wasps" so it packs in to the end of the hose about 50mm, insert end of hose just inside entrance to the hive and give a decent big huff on the other end. This scatters it all around where they walk in and out and they track it all in to the depths of the hive - job done. Petrol dont work that well, doesnt actually kill the whole nest.
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