Homemade Roach Killer To make a homemade roach killer, mix 2 to 3 tsp. of boric acid with equal parts of sugar and water to make a paste. Put it in the areas where roaches normally reside, and sprinkle it around the infested areas of your home. This method will eliminate roaches within two weeks.
This DIY recipe is great especially when you have kids or pets around. This recipe is simple, with only 3 natural ingredients! All you need is 2 parts borax per 1 part powdered sugar. Then add a few drops of peppermint essential oil. Just mix it up and sprinkle it around the areas you are having roach problems. I keep the rest handy in a mason jar.