Scrub out any food containers, using a bleach solution of two or three capfuls per gallon of water for the final rinse. Wash out the affected lockers and any adjacent ones, also using a bleach solution. Let the containers and lockers dry completely before using them, since a moist environment attracts bugs. When you refill the containers or lockers, be sure to use the bay leaves, cloves, and cockroach traps as I described above.
With these techniques, you can win this battle with the insects without resorting to that most drastic of solutions: the bug bomb.