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Thanks for this link and your replies in this thread. As someone who had to feverishly dust boric acid around my kitchen last summer (because in Washington state, it seems many online stores like Amazon don't want to ship anything effective. Maybe regulations?), I'm looking forward to trying out Vendetta Plus or something similar if these German roaches return.

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Incidentally I've actually found "natural" solutions like boric acid and diatomaceous earth to be wildly effective (in killing/reducing established populations, not preventing new ones), if a bit unsightly and inconvenient to have lying around in piles to actually force the critters into crawling into them.

I probably ought still spend a day off sealing everything I can, though. Probably more pragmatic and less technically barbaric.

I would recommend getting an actual duster (aka "hand bellows"), especially one that has an actual spring to return the bellows instead of just a "plastic spring". I learned it from this video [0].

It really helped to basically make the dust small enough for the roaches to scurry through (instead of avoid like a pile). They don't really want to eat it (like bait), so they need to accidentally walk through it and then clean themselves (and incidentally ingest it).

[0] https://www.youtube.com/watch?v=ubfUacj7zQQ

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