How can wasps be kept out of birdhouses-without harming the birds?
by
Laurie
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Here's a cool trip that I heard: rub a thin layer of bar soap on the inside surface of the roof. The slippery surface prevents the insects from attaching the nest to the wood. Don’t use any oils like Crisco which could melt and get on bird feathers. A little Ivory Bar Soap rubbed on the inside of the birdhouse roof doesn’t hurt the birds and deters any insects from attaching a nest inside. Good luck!
Several videos on YouTube adress the issue: https://www.youtube.com/results?search_query=keep+wasps+out+of+birdhouses