Before going through all the work of replacing the seal, or getting the rental agency to do it (getting things fixed hasn’t been the easiest), I scrubbed the whole bathroom down with bleach today. I took the toilet seat off and scrubbed all hinges and screws. I scrubbed the walls and cupboard around it and took a toothbrush to the grouting at the bottom. Unfortunately it is the bathroom without the window for ventilation. So, now I’ve got the air purifier running in there. We’ll see if it smells within the next couple days or not. It would be nice if this fixed the problem but I’m not holding my breath. (Well, actually I was. The bleach smell was overwhelming!!)