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I had this problem once before when a relative came to crash with me and brought roaches in her boxed up crap. I tried all the over-the-counter methods and had an exterminator come for 6 months... still saw roaches. Finally I cracked and brought in the more expensive exterminator and after one visit they were gone for good. He said you have to use multiple methods because some are immune to certain poisons. He used gels, powders, sprays, and left out those little roach hotel things. I imagine that living in an apartment building you would have to keep them coming regularly since your neighbors probably won't be exterminating.
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