I noticed a foul stench the other day. I traced it back to one of my HVAC vents. It was then that I remembered about a week ago I put out some mouse poison in the basement. The little bastard must have crawled in there and died. I thought the poison was designed to make them go outside looking for water? Anyway, I think I have it narrowed down to a 14 foot stretch of horizontal ductwork. Unfortunately it is not easy to get to with bends and elbows in the ductwork at both ends. It is in the ceiling behind drywall. I stuck a shop vac hose in about 6 feet with negative results. Several sites online basically said dont waste your time punching holes in the walls and ducts, just wait it out until it dries up. The stench is BAD. I have it sealed off with duct tape now but it still seeps through any crack in the trim. The plan now is to have the HVAC guy punch one hole in the middle of the 14 foot stretch, look both ways and hope the rat bastard is in there. Any suggestions?