Boric Acid
And while it's harmless to people and pets, it's deadly for roaches. When cockroaches come into contact with boric acid, it sticks to their legs and wings. When they ingest the powder, it acts on the roach's nervous and digestive systems - killing it rapidly.
How long does boric acid take to kill roaches?
How long does it take boric acid to kill roaches? Boric acid kills cockroaches within three days of coming into contact with it.
What do you mix with boric acid to kill roaches?
Mix one part powdered sugar and three parts boric acid. The great thing about this recipe is that you can either choose to put it in a container or just sprinkle it in roach infested areas.
