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Boric acid will kill a roach in about a day. Boric acid is eaten by the roach and paralyzes them so they can't move or eat.

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Q: How long does it take boric acid to kill roaches?
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Get rid of ants?

There is a difference between boric acid and borax, which is the laundry additive. Boric acid is usually found at drugstores or pharmacies, and borax (the most common brand name sold is 20 Mule Team) is found in grocery stores.I've provided a link to an article that explains how to make a borax ant case you have no luck finding boric acid.I actually have this problem every year.I recently came across a website that said boric acid powder helps kill them for good. So I gave it a shot since the boric detergent cost me only $3 from target and raid cost me $4, but raid only temporarily solves the problem."First, pick up some Boric acid powder (available at most drug stores) and mix a small amount of it 50:50 with table sugar. There's nothing particularly scientific about this ratio, so it's fine to just eyeball it. Next, put some of this mix into a small container such as the the cap from a milk jug or the lid from a 2 liter bottle. Finally, drizzle some water into it to make a slurry (i.e., a thick suspension). That's it - you're now ready to kill some ants.Once your concoction is ready, simply set the mix in the path of the oncoming ants (they usually form a foraging trail) and then wait. At this point it's important to be patient and not kill any of the ants yourself. The reason for this is that you want them to take your tasty treat back to the nest with them. Boric acid is toxic to ants, but it doesn't work immediately. As such, you need to let them forage and then take it back home to share with their nestmates - this will ultimately wipe out the entire colony."Source:

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