When you think about what needs cleaning in your home, the bathroom probably makes the list. But chances are, there's one part you’ve overlooked completely: the exhaust fan. Most people forget it exists until it starts making noise or stops working altogether. But here’s the truth: your bathroom exhaust fan is often one of the dirtiest components in the entire house. And if you’re dealing with mold or poor air quality, it’s definitely something you don’t want to ignore..