Every once in a while this horrible smell cones out of the bathroom. Smells like urine. It will be there for a few days to a week then goes away but it is overwhelming when it's there . The bathroom is clean. And it comes and goes. What could it be?
Do you use that bathroom often? If the sink goes without use for an extended period of time you might get a sewer gas smell. The p-trap in the sink drain can dry out causing sewer gas to leak through the drain. The next time it happens run water in the sink and if you have a tub or shower then there too. See if it helps.