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spelling/key entry error. That's Borax powder.
Use boat powder. It kills all insects that have exoskeletons. It's cheap and safe. It kills ants, roaches, etc. it kills because of the sharp edges on its crystals. That cuts into the exoskeletons and the insects simple dehydrate.
It won't kill flies. The insect must have an exoskeleton; a hard shell.Wasps? I don't know, but I bet it would. Don't wet it or put it in water. It's the sharp edges of the crystals that do the damage. Just sprinkle it around wherethey reside, feed or come in through cracks.