Will Wd40 Kill Wasps. Wasps are predators that are very territorial, returning to the same nesting location year after year. They'll crawl into the jar and eventually fall into the liquid and drown. Wait until it's dark outside before emptying the container of its contents and refilling with a fresh batch of juice/jam.

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It kills any that it touches (best to do at night after the bugs return to the nest) and they will never return to the sight because of the residue. Instead of having to knock them down after they're already built. They'll crawl into the jar and eventually fall into the liquid and drown.

Spray the top of the feeder to create a slippery surface that makes it difficult for squirrels to balance on.

I use that wasp spray for nests but the lone wolf that's hanging around may get the. Wasps are predators that are very territorial, returning to the same nesting location year after year. This thread is not about destroying wasps nest or killing them directly! Any time i find a wasp nest, i spray it with wd40. There had to be a way! Anyone know if it will work without wreck. Spray the nests and the individuals. If you live in a house that sees a lot of wasp nests being built up each spring, this trick is for you!