I need to exterminate several large ant colonies on my property. I've made a few attempts in the past, but they keep coming back stronger than ever. Recently discovered a huge hill behind some bushes not far from the house, this thing is probably 3 feet long and 2 feet wide! Another one is easily a foot and a half high and probably 14-16 inch diameter. Wasn't sure what it was so gave it a kick, sure enough ant hill. Any surefire solutions? Looked online but the remedies there seem pretty weak to me,like pouring hot soapy water on it. Anything I can use that will put an end to the whole colony?