Boric acid powder is the best roach elimination/preventative method out there! I prefer Boractin over the less expensive boric acid powders (Dollar Tree for example) because it is much finer and easier to "dust." It doesn't clump up due to moisture in the air. I had a temporary refrigerator delivered to my rental unit while a new one was being ordered. Unbeknownst to me, there was a roach nest in the back, where the electrical parts and motor are. I had a roach infestation within 3 weeks--it was like a horror movie! I initially sprayed (knock-down method) to kill as many as possible, then attached the IGR discs (Insect Growth Regulator) in cabinets. After that was done, I used Boractin with a bulb duster. I put a very thin layer in all cabinets, on very top of cabinets near ceiling, under fridge, stove. I bulb dusted in kick plates under cabinets and electrical outlets. I dusted counters and floors each night before going to bed. I also drilled holes about 18" apart in the walls (in kitchen) over the cabinets and dusted inside walls. I saw an immediate reduction within 3 days and complete elimination within one week. I made our apartment as uninhabitable to roaches as possible. I felt sorry for the people next to me as I'm assuming that's were a majority of them fled to while they were dying from the Boractin. I have since moved and still use Boractin as a preventative measure. I lightly dust cabinets, under fridge and stove, and on top of cabinets. I redo this about every 10 months. Have not seen a roach or ant, and I live in swampy South Florida!
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