marion w wrote:

We have tin roofs and wasps have
Built nest in the eves of the house.
12 feet up. We use foam wasp spray,
Works great coming out of nest. How
Do we kill the nests?

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You have to saturate the nest with spray, it has a residual killing
action for a couple weeks. Wait at least a few days so it can kill ones
that were away as they return, then remove the nest. It's a never ending
battle.