Hi Debbie, sorry you are dealing with cockroaches. Hope this is helpful To make a roach killing paste, combine 3-teaspoons of boric acid with 3-teaspoons of sugar and 3-teaspoons of water. Mix the ingredients into a paste. They apply your homemade roach killer in areas where you've spotted roaches.
How to Make a Homemade Roach Killer | DoItYourself.com
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Something as simple as soap and water can be a very effective killer of cockroaches, although it won't eliminate the nest. This just kills the roaches it reaches. Pour a cup of water into a spray bottle then add one teaspoon of liquid soap. When you see a roach, spray the mixture on it.