My neighbor's young daughter saw a couple of snakes slither under our house yesterday. There is about 3' of overhang not resting on the foundation and there is less than a foot clearance. Naturally, she has no idea what sort they might be; but I would like to get rid of them in any event. If it were a cave, I would use some gasoline mist, but this is my house and I do not think so. Any thoughts? If I tossed some dry ice in there, I wonder if they would come out?