How to make an organic ant killer. You can use Borax laundry soap. Some people use sugar.6 to 1 ratio. 6 sugar and 1 borax. But I get the best results with PB, used a half jar of PB before I killed a billion of them. Bot they are not in my house any more.And my driveway is almost any free. This is how I wipe them out at my bird feeder too.. They use to fill my cats food bowl in 15 minutes too.