Safest way is to call in the experts. You may not be stung by the wasps but could be by the expert!
Cheapest way. Purchase a Wasp Killer aerosol. Keep well covered for safety and spray into the nest.
I've tried it successfully.
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New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.