1. Take a half-liter jar and pour about 3 tablespoons of vegetable oil into it. You can replace the oil with beer and grease the walls of the jar with petroleum jelly. The jar will look like a trap from which cockroaches cannot get out.

2. To eradicate cockroaches, you should wash the floor with the addition of a small amount of ammonia.

3. Take a small cardboard sheet (30 * 30) and glue it with double-sided tape, slightly not reaching the center. Place a spoonful of mayonnaise in the center. The cardboard and tape will act as a trap and prevent the cockroaches from escaping.

4. Mix hard-boiled yolk with the same amount of boiled potatoes and boric acid (20 gr.), Roll up small balls and lay them around the perimeter of the kitchen.