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Dr. Md Rushad Rahman
এমবিবিএস(আরপিএমসি)
,
পিজিটি(মেডিসিন)
You can use some form of insecticide to get rid of them, like a dry powder. You can apply it directly into the wall void or around the exterior of the hole that they're using to climb in there. If you want to go the non-pesticide route, there are companies that will actually cut into the wall and vacuum the yellow jackets out for you. Not all companies will seal the hole back up though, so you may need to hire a contractor to do that for you.
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