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I used to work for a municipality and spoke often with the pest control man. If one has a really bad infestation that has existed for a long time, his/her only option is to move. They always live in walls and even tenting a house for fumigation will not get them all. Sorry to be so pessimistic, but it's true. A pro will not tell you that, preferring to get your money. Also, boric acid is the best to use. To heck with all the poisons. All this info comes from a pro with no incentive for money. He worked for a city government. Good luck.