Welcome to Domestic Disasters, where we take a look at some of your worst mess-ups and grossest finds. We take them to the experts to find out how big of a problem they are and how expensive they are to fix.

A few years ago, Tim and Kathy found their dream home in Atlanta suburbs. The house was about ten years old, which to them was the ideal age — old enough for the quirks to have all been fixed, yet still new enough not to have any major issues. But, a year after moving in, the bathroom started emanating a gas-like, sulfur odor.

It wasn’t the first odd smell in their bathroom. A few months earlier, they’d experienced a sewage smell, which they soon figured out was caused by mold in the toilet tank. But the shower drain smell was more elusive. They called a couple of plumbers, who couldn’t find anything wrong. They also searched for answers on a Reddit forum , where they discovered that dozens of people had the same mysterious issue.

“I was convinced something died in the walls,” commented one person.…