How can I get rid of cockroaches?

Control Methods Traps Cockroach
Traps are used primarily for monitoring purposes. If you find large numbers of cockroaches in your trap, they are probably living or feeding nearby. If you have a lot of cockroaches, using traps alone probably won’t get rid of them. Traps usually have a bait to attract the cockroaches. Sometimes bait is a poison, so keep traps away from children and pets. Some traps work better for certain kinds of cockroaches; try a different trap if yours isn’t working. Put traps in the paths cockroaches use - along the edges of walls or in cabinets.
If you have only a few cockroaches, you could use a heavy duty vacuum to sweep them up. They should suffocate in the dust of the bag. Throw out the bag to make sure they don’t escape.
Pesticides
 If you use pesticides to kill cockroaches, use the least toxic available. These pesticides will be labeled with the word “Caution.” Pesticides are poisons, so follow label directions and use them carefully. Don’t use pesticides around food or on food preparation surfaces. Keep children and pets away from areas where pesticides have been applied, as the label requires.

The following pesticides will kill cockroaches and pose less risk to people and pets when used properly: Boric acid is a powder used in cracks. Cockroaches will either walk through it, attaching it to their body, or eventually eat it. A light dusting is all you need. Buy a product with a nozzle so you can squirt it into a crack. Baits are used to attract and poison cockroaches when they eat them. They can be purchased in pet-proof and childproof containers. You may need to set out several containers. You could also hire a professional pest control company to help you.

Some control methods take time to work. If you have a lot of cockroaches, it may take a few weeks, a month, or longer to get rid of them.

Alway contact pest control in the extermination of cockroaches

How to get rid of small cockroaches(not bigger ones) in kitchen? No pest control is working?

Homeowners can detect conditions that will foster the development of infestations through frequent inspections. Sanitation Proper sanitation, both indoors and outdoors, will led to a high cockroach populations. Do not leave unwashed dishes, kitchen utensils, and uncovered food out overnight. Clean up all spilled liquids. Areas beneath and behind cabinets, furniture, sinks, stoves and refrigerators should be cleaned often, as should cupboards, pantry shelves and storage bins where particles of food frequently accumulate. Kitchen waste and excess refuse should be kept in cockroach proof container and disposed of as frequently as possible. Dry pet food should be stored in tight containers away from the kitchen and other food. If pets are fed indoors, leftover foods should not be allowed to remain in the feeding dish overnight. Outdoors, garbage cans, racks, platforms or slabs should be cleaned regularly Exclusion Discourage cockroaches from entering the home by sealing any cracks of 1/8 in or more in the foundation and exterior walls. Check the seal or caulking around air conditioning unit, windows, doors, pipes or other openings into the home. Inside the home eliminate all possible hiding areas and food sources. Repair cracks and holes in floors, walls and ceilings. Seal openings around plumbing fixtures, furnace flues, electrical outlets, windowsills and walls, and along baseboards and ceiling moldings. Leaky water faucets and pipes should be repaired. Thresholds on doors should be as tight as possible and cracks in porches and stoops should be sealed Eliminate Hiding Places Paper, Cardboard, lumber, firewood and other debris next to the home provide excellent refuge for several cockroach species. Keep yard trash and stacks of firewood away from the home or garage to minimize the chance of cockroach invasion

Eliminate Hiding Places

Paper, Cardboard, lumber, firewood and other debris next to the home provide excellent refuge for several cockroach species.
Keep yard trash and stacks of firewood away from the home or garage to minimize the chance of cockroach invasion
Exclusion

Discourage cockroaches from entering the home by sealing any cracks of 1/8 in or more in the foundation and exterior walls.
Check the seal or caulking around air conditioning unit, windows, doors, pipes or other openings into the home.
Inside the home eliminate all possible hiding areas and food sources.
Repair cracks and holes in floors, walls and ceilings.
Seal openings around plumbing fixtures, furnace flues, electrical outlets, windowsills and walls, and along baseboards and ceiling moldings.
Leaky water faucets and pipes should be repaired.
Thresholds on doors should be as tight as possible and cracks in porches and stoops should be sealed
Sanitation

Proper sanitation, both indoors and outdoors, effectively limits cockroach populations.
Do not leave unwashed dishes, kitchen utensils, and uncovered food out overnight.
Clean up all spilled liquids.
Areas beneath and behind cabinets, furniture, sinks, stoves and refrigerators should be cleaned often, as should cupboards, pantry shelves and storage bins where particles of food frequently accumulate.
Kitchen waste and excess refuse should be kept in cockroach proof container and disposed of as frequently as possible.
Dry pet food should be stored in tight containers away from the kitchen and other food.
If pets are fed indoors, leftover foods should not be allowed to remain in the feeding dish overnight.
Outdoors, garbage cans, racks, platforms or slabs should be cleaned regularly