I am in the middle of a bathroom remodel. The sink and toilet are removed and I have open waste pipes. I stuffed an old shirt in the toilet flange and a sock in the sink pipe to stop any gasses from coming up. This was working for a few weeks, but now the smell is coming through. I even tried a plastic bag under the shirt stuffed in the toilet flange. Anyone have any other ideas??? This gas is really bad!!!!!!!!! Please help