Answer: Boric Acid will not kill rats, mice or any other mammals. To kill rats and mice you will need to consider using snap traps, glue boards or poison baits.

What kills mice and rats instantly?

Set Traps

Traps are one of the most effective ways to get rid of rats fast. For best results, consider using snap traps, which are a fast method to kill rats instantly. To prevent other animals from getting into the traps, place them inside a box or under a milk crate.

Will borax keep mice away?

This is one of the simplest ways of keeping your house mouse-free. ... This is an effective way of exterminating mice, but can be risky if you have children or other pets. Apart from the commercially sold 'rat poisons', bait mixed with borax powder can also be used as an easily available rodent poison.