Your treatment to Electric outlets will have no effect German roaches like dark damp near a food source they’re not bugs are coming from the outside more than likely they were brought home and some sort of a corrugated paper products from some sort of a food mart.
I would recommend hiring a professional with a one time treatment 90 day guarantee or A one time treatment with a one follow-up visit.
The German cockroach breed at an alarming rate the longer you wait the worse the infestation home treatment usually scatters the infestation does not remove it and now you’ve just placed dangerous chemicals within your living environment. I speak from experience I owned three extermination company’s when I lived up north.
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