WD40 works well exactly as you have described,however it will leave a oiley mark on the paint if it comes in contact.
I live close to the River and we have terrible problems with wasps. Several years ago, my neighbor had to remove his siding on the house to spray, remove their nest, and rid them.
The biggest problem Ive had is them building their nests in the eves, bbq, wood piles...ect. I have found if you purchase wasp spray and spreay the eves in the spring before they show up they will smell the spray and not build nests. Haven't had to knock down a wasp nest in years.
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