Found a cockroach? (Saw a GAZILLION?) Don’t panic.

Keep them starved and parched

Store food in tightly closed containers off the floor and away from walls, or keep it in the refrigerator. Rotate stock, inspect.
Scour the kitchen. Clean refrigerator; stove; cabinets; drawers; counters; floors; walls; corners; fixtures; and under the sink. Keep it clean!
Empty and secure trash, compost, and recyclables every evening.
Repair leaks. Seal gaps around pipes, tubs, and sinks. Keep bathroom dry. Eliminate other "watering holes."
Wash and dry dishes promptly. Wipe up spills and puddles.
Don’t leave pet’s food or water unattended.

Eliminate their shelter

Remove clutter and debris (both inside and outside).
Secure loose wallpaper, counters, and splashboard.
Check inside equipment (even motors– anywhere it’s warm and dark) such as clocks, televisions; stereos; radios; and computers.
Vacuum furniture and drapes.
Seal gaps in cabinets and woodwork.
Empty and clean bookshelves.

Prevent future invasions

Close openings around pipes, vents, drains, registers, ducts, and electrical chases.
Fix cracks in walls (inside and out) and floors.
Tighten doors, windows, and screens.
Inspect bags, boxes, furniture, and other items before bringing them into your home.