Although not homemade, investing in a cheap bottle of hairspray can be a great way to kill off cockroaches. Spraying them with hairspray will cause their wings and legs to stick together and they will slowly suffocate. Does hairspray kill spiders? how fast does hairspray kill spiders.

Is there a spray that kills roaches instantly?

Raid Ant & Roach Killer Insecticide Spray was found to be one of the most effective at killing cockroaches. A can is helpful for the times when you spot a roach in your home and you don’t want to get too close. A roach spray should kill the bug almost instantly.

What kills roaches quickly?

Boric acid: Used correctly, boric acid is one of the most effective roach killers. It’s odorless, has low toxicity to pets, and since it isn’t repellent to roaches, they will not seek to avoid it, crawling through it repeatedly until it kills them.