Hand dusters work for small jobs, but for larger applications, like dusting wall voids or ceilings, you need something that puts out a lot of dust. If you really want to kill the bugs, then build one of these. It works with all dusts, including diatomaceous earth, and boric acid.

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Video on how to treat German cockroaches:    • How to Get Rid of German Cockroaches....  

Shop Vac: https://www.amazon.com/dp/B0BCT1CRYS?...

Air pump attachments: https://www.amazon.com/dp/B07TZ419Z8?...