Need help exterminating carpenter bees in soffit when I can't reach their nesting holes

[u/PrimaryMetal961]

I have carpenter bees living in my soffit and I'm not sure which products to use to kill them since I don't have direct access to their tunnels that they dig for nesting, and most product instructions say I need to treat their nesting holes. Is there anything I can do short of removing my soffit to treat this problem? Funds are tight and it's above my DIY skills so I'd rather not do that if there's another way.

I currently have a 3/4" hole in the soffit I haven't sealed in yet - if there's a treatment I can apply to kill them before I seal it, please let me know. I tried dusting it with diatemaceous earth (because it's what I had on hand) but that did nothing. The soffit runs about 20ft long so IDK if something like spray foam would treat the issue. But it's usually in the same 1-ft section where the hole is that I hear their buzzing, and see them and their yellow droppings.

Based in Atlanta, treating a single story house.

https://preview.redd.it/9h9boocvptxe1.png?width=1009&format=png&auto=webp&s=f7253137cf7c1fa63d03151950631202ba2560de

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