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How to trap cockroaches
Try making a duct tape trap.
The premise of this strategy is simple: you'll need bait to attract the cockroaches, and adhesive to keep them there. This trap can be difficult to move once you have set it, but it is a simple trick, and you may yield a high reward for relatively little effort.
You can also find adhesive-based traps, if you prefer to buy them. Look at home-and-garden stores, or ask your local exterminators for advice.