Invest in a garden sprayer. Fill it with sugar water and ice. As soon as you arrive on sight. spray them down. Then unload. It won't prevent all fly offs but it will help.
good idea. I didn't even have time for that on the two low hangers. They flew as I was literally turning off car and getting out. One was in backyard and all I saw was a cloud going over house. The third was suppossed to be 7ft off ground. It was about 45ft. the man was wheeelchair bound and I think was lonely and didn't tell me the truth when I asked him how high. I am not a fan of heights as it could interfere w/ day job. Not worth risk for me at this stage in life. This man has a hive in an old walnut tree about 60ft off ground. I'll talk to him about a swarm trap for next season.