Rotten egg smell could be two things.
Attic smells fruity.
This odor takes time to develop inside of a home and is usually caused by dampness and moisture that is present within the environment.
The musty smell that you may be smelling inside of your home is an odor that is often described as having a stale moldy or damp odor and usually impaired by mold or mildew.
If squirrels have ever been in your home it s important to thoroughly remove all squirrel smells.
Let the bleach sit for 30 to 60 minutes then run the hot water or flush the toilet again.
Another potential source of attic odor is from a combination of rodent droppings and urine when mice or rats take refuge in the attic they are naturally going to do their business here.
Not only is the smell of squirrel droppings urine sweat and body oils unpleasant to many humans it can also lure other squirrels to the same spot.
A rotten egg smell might be a potentially dangerous natural gas leak.
If the odor persists you may need to rent or purchase a plumber s auger or snake to dislodge the clog.
Such odors may even make the items or clothing you re storing in your attic smell as well.
If the smell is in fact coming from your furniture or carpet cleaning and reupholstering is an option.
If you notice this type of odor coming from your attic avoid entering it unless you are wearing a proper respirator.