If you are dealing with a cockroach infestation, you may use a professional cockroach killer paste as a way to annihilate the little critters. I personally prefer boric acid to get the job done, but either one will work.
The one big disadvantage of the paste is that because of its color, it can leave a brown or black stain on whatever you apply it to. To me that is a pretty big disadvantage. It gets dispersed over time and it’s not as clean as the white powdered boric acid that will not stain.
The paste acts as a bait because it contains both food and water that the cockroaches is attracted to. After ingesting the paste, it returns to the colony of roaches and spreads the poison to the others, increasing the velocity at which they die. It takes a few days for it to do its dirty work in then you will start to see the results, dead roaches appearing about the place.
All you do is put some paste in a few inaccessible areas around the house, places where children and pets can not get to but roaches can. You know, under the cabinets and behind the appliances, etc. The label says that the ingredients are not toxic to pets, but I personally wouldn’t be one to trust that advice. Put it in places that you know your pets for sure can’t get to.
You may also make homemade cockroach killer paste, but I’m not going to get into that in this article. A tube of this stuff is so cheap this is no real reason to go that route. But like I said, I would go with boric acid over the paste as my choice as I think it is the most effective product for killing roaches.