No need for expensive, smelly, and toxic cockroach killers that leave a residue. Spray cockroaches with any ammonia-based cleaner (e.g. Spray 'n Wipe). Ammonia is deadly to living things. And you clean your bench/floor at the same time! The ammonia smell dissipates quickly. It's best to angle the spray so that it reaches underneath the insect, where their breathing tubes are.
Like most animals, cockroaches need to eat and drink daily so discourage them with ruthless food hygiene and cover all your drains with strainers, so they can't climb down the p-trap and get to a water source. They'll soon move elsewhere for easier pickings.
By debmw from Sydney, Australia
We have found a way to kill roaches on contact. Pine-Sol and water. Put in a spray bottle, about half-and-half. Smells great, and it cleans good. I have not tried it with the blue or yellow only the original. Hope this helps. Also kills earwigs on contact.
I think the strainer fort he drains is a good idea. I never would have thought of this, that they would climb down the drain or a water source! I have had good luck with baking soda. Also, it kills them after they eat it after about forty eight hours.
Fill a spray bottle with Ajax powder with bleach and water and spray directly on the little sucker and kills instantly 5 to 10 seconds. Then just sweep up with a dust pan and dump in the trash. Works for the big one as well.
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