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.

What kills cockroaches instantly?

Borax is a readily-available laundry product that’s excellent for killing roaches. For best results, combine equal parts borax and white table sugar. Dust the mixture any place you’ve seen roach activity. When the roaches consume the borax, it will dehydrate them and kill them rapidly.

What smell do cockroaches hate?

Roach Repellents Peppermint oil, cedarwood oil, and cypress oil are essential oils that effectively keep cockroaches at bay. Additionally, these insects hate the smell of crushed bay leaves and steer clear of coffee grounds. If you want to try a natural way to kill them, combine powdered sugar and boric acid.