How to kill cockroaches? Washing powder is an efficient drug for trapping and killing cockroaches, and its effect is even better than some chemical pesticides. The practice is that the washing powder is scattered in the places where cockroaches may haunt, and it will die after eating the washing powder. 2, take borax, flour, and a little sugar, mix them well and make them into balls the size of rice grains, scatter them in its haunt, and be poisoned after eating. 3. It is a method of killing cockroaches with hot soapy water. Adding a piece of soap to 4 liters of hot water, dissolving it and spraying it directly on cockroaches can effectively kill cockroaches. 4. It is the method of killing cockroaches with soda. Sugar and baking soda powder are mixed half by half and placed in the roaches' haunt. After about 3-14 days, cockroaches will disappear. It is said that this is also the most commonly used secret recipe for preventing cockroaches in the United States. 5. It is a boric acid mopping method to prevent cockroaches. After dissolving a proper amount of boric acid in hot water, wipe the floor with a mop or rag. After drying, white boric acid crystals will penetrate into the cracks in the floor to prevent cockroaches and ants. 6. It is the cockroach prevention method of orange and lemon peels. After the peels of oranges and lemons are dried or baked, they are placed in various cabinets, which not only has the function of fragrance, but also has a certain cockroach prevention effect. 7, boron sand, flour, sesame sugar). Mix a little boron sand with flour, and then drop a few drops of sesame oil. Make a ball. Roll the paper into a tube, and then put the prepared pills into a paper tube. 8, sugar water bottles to catch cockroaches Take 1-2 cans, put 3 spoonfuls of sugar water, add boiling water and half a bowl to make bait, and put the bottles in the place where cockroaches are active. After smelling the sweet smell, cockroaches will climb into the "trap" of the cans. 9, tung oil to catch cockroaches Buy 111-151g tung oil, heat and boil it into sticky colloid, and apply it around a board or cardboard with a square of 1.5cm. Put greasy and fragrant food as bait in the middle, and cover other foods to prevent it from stealing food. When cockroaches feed, they can be stuck as long as they climb to the place with tung oil. Cockroaches' weakness: Cockroaches are omnivorous insects. They are hungry but not thirsty. When killing cockroaches at home, citizens should block the water source, turn off the tap, dry the water traces, scratch with a pen or put poison bait around the pool, urinal and refrigerator base to make cockroaches contact poisoning when taking water and feeding. Three tricks to drive cockroaches. 1. Place fresh oleander leaves where cockroaches move, and cockroaches will no longer come near here. 2. Put fresh cucumbers in the cupboard, and cockroaches will stay away. 3. Put a plate of chopped onion slices indoors, and the cockroaches will run away immediately when they smell it. Home-made cockroach killer raw materials: potatoes and boric acid. This boric acid can be bought in chemical shops. First of all, wash the potatoes and steam them in a pot for about 15 minutes. Take boric acid with the same volume as the potatoes and crush the potatoes to make them fully mixed with boric acid. Pay attention to it and make sure to mix them evenly. The next step is to knead the mixed boric acid mashed potatoes into pieces, so that the home-made cockroach killer is ready. The next thing to do is to put it in the place where cockroaches often haunt and wait for it to eat. Finally, I would like to remind you that if you have other small animals at home, you must take good care of your beloved pet so as not to cause harm to it. Well, home-made cockroach killer, if your home is bothered by cockroaches, you might as well try it.