In our 70 year old home which we've owned for a 2yrs now we have found we have a clogged vent stack. It stared with gurgling noises from the toilet, and then sewer smell from the shower drain. We have had a professional come and try auguring it with a small auger (large is said to be dangerous)as well as a hose attachment with a high pressure output of water. Neither of these methods worked. Also I have physically tried to break through the clog.

Is there any method we have not tried to remove the clog short of putting a hole in the wall so the larger auger can be used?